DARPA's Innovation Timeline: Disagreements | Network, Not Protocol

On November 13, 2026, Mark Nichols set the "Innovation Timeline" of the Defense Advanced Research Projects Agency against dated documents and found that its entry on the ARPANET, under the year 1969, is false as written where it says that in 1968 the agency "contracted BBN Technologies to build the first routers," because the contractor's own history says "The contract was awarded and work began the second day of the New Year in 1969," and that the timeline's entries for 1969 and 1973 credit the ARPANET and the optional protocols TCP and IP with the Internet in soft verbs, "led to the Internet" and "remain a mainstay of the Internet’s underlying technical foundation," that the honored paper of 1974 and the definitions of this site do not support.

Preamble: I created this page to examine how the Defense Advanced Research Projects Agency describes its own part in the ARPANET, in the optional protocols TCP and IP and in the Internet on its page "Innovation Timeline," which the agency serves at darpa.mil. The timeline is a record of 480 lines, most of which concern weapons, aircraft, materials, satellites and other programs of the agency, and only a few of its lines make claims about networks, so this page answers those lines, names the dated documents that decide them, and reproduces the whole timeline line by line so that every line can be read in place. Each disagreement on this page cites the timeline's line by its number in Exhibit A in section 8.0. Defense Advanced Research Projects Agency, "Innovation Timeline" · Disagreements of Published Claims | Network, Not Protocol · Soft Verbs: A Running Register | Network, Not Protocol · The Governing Definitions and Controlling Facts of Telecommunications Internetworking. This page is Disagreement 73 in the standing index of the series, Disagreements of Published Claims | Network, Not Protocol, and a finding on this page is cited by that number followed by the finding's locus, as Disagreement 73, 1.1.

Opinion Rules: You are visiting my record, and I am the subject matter expert on it. If you are a subject matter expert too, I want to hear from you: bring your document and I will answer it on the record. If you are not, you are welcome here to read and to learn. The documented-challenge terms of marknichols.com and the condition on opinion are stated at F40 of The Governing Definitions and Controlling Facts of Telecommunications Internetworking, and they govern this page.

0.0 This section records the timeline this page examines, the documents this page relies on, the way the line numbers on this page are read, the definitions and rules the findings apply, the audit of the timeline as an authority, and the order of the sections that follow.

0.1 This page examines the page "Innovation Timeline" of the Defense Advanced Research Projects Agency at https://www.darpa.mil/about/innovation-timeline, with the heading "Redefining Possible." The page prints no author, no date of publication and no date of last revision, so this page names the timeline by the date on which it was read, November 13, 2026. The timeline was read in full on November 13, 2026, from its first entry, of 2025, to its last entry, of 1957. "The ARPA Model: A Reading List," which The Institute for Progress ARPA Model Reading List: Disagreements | Network, Not Protocol answers, links the address https://www.darpa.mil/about-us/timeline/creation-of-darpa, and on November 13, 2026 that address delivered this timeline.

0.2 This page relies on the following documents, and it states for each document how it was read.

1. The "Innovation Timeline" of the Defense Advanced Research Projects Agency was read in full on November 13, 2026, as 0.1 records.
2. Vinton G. Cerf and Robert E. Kahn, "A Protocol for Packet Network Intercommunication," published in IEEE Transactions on Communications in May 1974, was read in full on November 12, 2026 for IEEE Milestone Transmission Control Protocol (TCP) Enables the Internet, 1974: Disagreements | Network, Not Protocol, and this page quotes the paper as that page quotes it.
3. BBN Report No. 4799, A History of the ARPANET: The First Decade, prepared for the Defense Advanced Research Projects Agency by Bolt Beranek and Newman Inc. and dated April 1981, is quoted on this page at its printed pages III-2, III-17 and III-35 as sections 2.0 and 3.0 of Wikipedia Defines the Internet Protocol Suite: Disagreements | Network, Not Protocol quote it.
4. RFC 1009 of June 1987, Requirements for Internet Gateways, by R. Braden and J. Postel of the Information Sciences Institute of the University of Southern California, is quoted on this page as section 3.0 of the same page quotes it.
5. Douglas C. Engelbart and William K. English of Stanford Research Institute, "A research center for augmenting human intellect," in the proceedings of the Fall Joint Computer Conference of 1968, pages 395 to 410, was read in full on November 12, 2026 for Wikipedia Describes Tim Berners-Lee: Disagreements | Network, Not Protocol, in the copy that Mark Nichols supplied from the ACM Digital Library.
6. The pages that the timeline links under the words "Read more" and "Learn more" were not read, and this page makes no finding on them.

0.3 Each line number on this page refers to Exhibit A in section 8.0. Exhibit A lists the text of the timeline line by line, in the order the timeline prints it, from its heading "Innovation Timeline" to its last entry, of 1957. Each disagreement also quotes the line it answers.

0.4 The capital-I Internet (D1) is the publicly joinable network of networks of the registry lineage, born in 1991 on the Commercial Internet Exchange agreement announced on March 25, 1991 by General Atomics, Performance Systems International, Inc. and UUNET Technologies, Inc. An intranet (D2) is a network, at any scale and under any protocol, whose members join by an owner's permission. Under D1.7, the words of lineage are not used on marknichols.com for the ARPANET, a government network whose users joined by permission. Under D6, the Internet protocols are the optional protocols TCP and IP, utilities whose messages the networks carry, and the optional protocols TCP and IP are not the networks and are not the Internet. Under D8, the World Wide Web is an application, announced publicly on August 6, 1991, and the World Wide Web is not the Internet. A lowercase internet (D11) is any interconnection of networks, including gated ones. Under the ruling of Mark Nichols of September 24, 2026 on protocol credit, the growth of the Internet is credited to the global physical network and to the operators who built and interconnected it. Governing Definitions, D1, D1.7, D2, D6, D8 and D11.

0.5 This page answers three kinds of disagreement, and each disagreement on this page names the kind that applies.

1. A documentary contradiction occurs when a dated record conflicts with a line as written. This page answers it with the dated record and a dated correction.
2. A scope overstatement occurs when the evidence establishes a narrower event, network, date or function than the line claims. This page answers it with the scope the evidence establishes.
3. A definitional disagreement occurs when the timeline and this site apply different criteria to the same term. This page answers it by attributing each usage to its source.

A sentence that carries a soft verb, a verb or verb phrase that gives credit for an outcome without stating an act that a dated document can confirm or refute, is answered under whichever of the three kinds its documents decide, and it is recorded in the register at Soft Verbs: A Running Register | Network, Not Protocol. Governing Definitions, F57.

0.6 The timeline names no author. This page applies to it the five checks that Mark Nichols ruled on October 2, 2026, and extended on October 23, 2026, for every authority a page cites or disputes, and the five checks return the following results.

1. The issuing body is the Defense Advanced Research Projects Agency, an agency of the Department of Defense, whose creation the timeline itself records at line 472. The page does not print the rule by which its entries are written, reviewed or approved, so that rule is stated on this page as unknown.
2. The roster on the date of the act cannot be stated, because the page prints no date of publication and no author, so the writers of its entries are stated on this page as unknown.
3. The instrument is a web page with no named author, no date and no recorded approval.
4. The custodian is the Defense Advanced Research Projects Agency, which serves the timeline at darpa.mil as a page that it may change at any time, which is why 0.1 fixes the timeline by the date on which it was read.
5. The overlap between the timeline's author and its subject is recorded here as a finding. The timeline is the agency's own account of the agency's own achievements, so the body that wrote it and the body that it credits are the same body, and at line 358 it names "DARPA’s Robert Kahn" as the official who began the work it credits for the Internet. This page makes no finding on why the overlap exists.

Under D12, contemporaneous primary documents control over retrospective accounts. The timeline is a retrospective account with no author and no date, so no line of it is carried on this page as controlling. Every disagreement below is decided by the dated document that the disagreement names, and not by the standing of the agency. Governing Definitions, D12.

0.7 Under F56, Mark Nichols ruled on October 23, 2026 that a sentence of history or of definition is true or false as written. This page reads every line of the timeline as written, and it reads every document that it quotes as written by the person or body that wrote it. The meaning an author may have intended but did not write is not in the record, and a line whose predicate is false as written is false, whether the falsity arose from compression, from shorthand or from intent. Each corrected statement on this page supplies the network, the document, the date or the event that the line left out. Governing Definitions, F56.

0.8 Sections 1.0 through 5.0 each state one disagreement, in the order of the timeline's own lines.

1. Section 1.0 answers the statement at line 125 that the DARPA Network Challenge was announced "To mark the 40th anniversary of the Internet."
2. Section 2.0 answers the entry for 1973 at lines 358 through 360, which credits a query of Robert Kahn with "the creation of the Transmission Control Protocol (TCP) and the Internet Protocol (IP)" and calls the protocols "a mainstay of the Internet’s underlying technical foundation."
3. Section 3.0 answers the entry on the ARPANET at lines 401 through 403, which says that the ARPANET's demonstration of 1969 "led to the Internet" and that in 1968 the agency "contracted BBN Technologies to build the first routers."
4. Section 4.0 answers the description of the ARPANET at line 430 as "the Internet’s precursor."
5. Section 5.0 answers the entry for Memex at lines 80 and 81, which calls web content "a subset of the Internet."

Section 6.0 records the statements of the timeline that the documents support. Section 7.0 states the findings of this page and their consequences for the timeline as an authority. Section 8.0 holds Exhibit A, the numbered text of the timeline.

1.0 Line 125 says that the agency announced the DARPA Network Challenge "To mark the 40th anniversary of the Internet," and line 127 dates the challenge to December 5, 2009, which dates the Internet to 1969 and is a definitional disagreement under D1 and D1.7, because the network of 1969 was the ARPANET and the Internet, with a capital I, was born in 1991.

1.1 Line 125 of the timeline, under the year "2008" at line 123, says: "To mark the 40th anniversary of the Internet, DARPA announced the DARPA Network Challenge, a competition that explored the roles that the Internet and social networking play in the timely communication, wide-area team-building, and urgent mobilization required to solve broad-scope, time-critical problems." Line 127 says: "On Dec. 5, 2009, in less than seven hours, the Massachusetts Institute of Technology (MIT)’s Red Balloon Challenge team found all 10 balloons."

1.2 Mark Nichols disputes the anniversary. A fortieth anniversary held in 2009 counts the Internet from 1969, and the timeline's own entry for 1969, at line 402, names the event of that year as the "initial demonstration" of the ARPANET. This is a definitional disagreement under D1 and D1.7.

1.3 Under D1, the Internet, with a capital I, was born in 1991 on the Commercial Internet Exchange agreement announced on March 25, 1991 by General Atomics, Performance Systems International, Inc. and UUNET Technologies, Inc. Under D1.7, the ARPANET of 1969 was a government network whose users joined by permission, and the words of lineage are not used on marknichols.com for it. Governing Definitions, D1 and D1.7.

1.4 This section records a definitional disagreement under D1 and D1.7 and does not count line 125 among the false-as-written verdicts.

1.5 Corrected statement: In 2009, the Defense Advanced Research Projects Agency held the DARPA Network Challenge forty years after the ARPANET's first nodes of 1969, and eighteen years after the birth in 1991 of the Internet, with a capital I, the publicly joinable network of networks of the registry lineage.

2.0 The entry for 1973 at lines 358 through 360 says that Robert Kahn asked Vinton Cerf to develop protocols "for sending packets of data across the ARPANET" and that the query "resulted in the creation of the Transmission Control Protocol (TCP) and the Internet Protocol (IP)," which is a documentary contradiction with the paper of 1974 that the collaboration produced, and its words "a mainstay of the Internet’s underlying technical foundation" are a definitional disagreement under D6 and the protocol-credit ruling of September 24, 2026.

2.1 Line 358 of the timeline, under the heading "TCP/IP," says: "In a seminal moment in the development of the Internet, DARPA’s Robert Kahn (who joined the Information Processing Techniques Office as a program manager in 1972) asked Vinton Cerf of Stanford University to collaborate on a project to develop new communications protocols for sending packets of data across the ARPANET." Line 359 says: "That query resulted in the creation of the Transmission Control Protocol (TCP) and the Internet Protocol (IP), most often seen together as TCP/IP." Line 360 says: "These protocols remain a mainstay of the Internet’s underlying technical foundation."

2.2 Mark Nichols records a documentary contradiction between lines 358 and 359 and the paper that the collaboration of Cerf and Kahn produced. The paper is titled "A Protocol for Packet Network Intercommunication," and it concerns communication between networks, not the sending of packets across one network. On page 2 the paper says: "It is thus apparent that the interface between networks must play a central role in the development of any network interconnection strategy." The paper continues: "We give a special name to this interface that performs these functions and call it a GATEWAY." On page 4 the paper names its program: "Within a HOST we assume that existence of a transmission control program (TCP) which handles the transmission and acceptance of messages on behalf of the processes it serves." The words "that existence" are printed so in the reprint. Section 1.0 of IEEE Milestone Transmission Control Protocol (TCP) Enables the Internet, 1974: Disagreements | Network, Not Protocol records that the paper contains the word "Internet" zero times, so the paper names no "Internet Protocol (IP)."

2.3 The soft words of the entry are "In a seminal moment in the development of the Internet" at line 358, "resulted in" at line 359 and "remain a mainstay of" at line 360. The hard claims that the soft words imply are that the query of 1973 was an act in the making of the Internet, that the query produced two protocols by those names, and that the two protocols are the technical foundation of the Internet. Under D1, the Internet, with a capital I, was born in 1991, eighteen years after the query. Under D6, the optional protocols TCP and IP are utilities whose messages the networks carry, and they are not the networks and are not the Internet, and under the protocol-credit ruling of September 24, 2026, the foundation and the growth of the Internet are credited to the global physical network and to the operators who built and interconnected it. The paper of 1974 itself assigns the interconnection of networks to the GATEWAY, as 2.2 records. Lines 358 and 360 are definitional disagreements under D1, D6 and the protocol-credit ruling, and the three lines are recorded as soft-verb credits at entries 10.1, 10.2 and 10.3 of Soft Verbs: A Running Register | Network, Not Protocol. Governing Definitions, D1 and D6.

2.4 This section records a documentary contradiction on lines 358 and 359 and definitional disagreements on lines 358 and 360, and it does not count lines 358 through 360 among the false-as-written verdicts, because the collaboration of Cerf and Kahn did produce a protocol whose program the paper abbreviates "TCP."

2.5 Corrected statement: In 1973, Robert E. Kahn of the Information Processing Techniques Office and Vinton G. Cerf of Stanford University began the collaboration that produced "A Protocol for Packet Network Intercommunication," published in IEEE Transactions on Communications in May 1974, which describes a "transmission control program (TCP)" within each host and assigns the interconnection of networks to the GATEWAY, and the Internet, with a capital I, the publicly joinable network of networks of the registry lineage, was born in 1991 on the Commercial Internet Exchange agreement announced on March 25, 1991 by General Atomics, Performance Systems International, Inc. and UUNET Technologies, Inc.

3.0 Line 403 says that "in 1968" the agency "contracted BBN Technologies to build the first routers," which is false as written, because the contractor's own history says "The contract was awarded and work began the second day of the New Year in 1969" and names the contractor Bolt Beranek and Newman Inc., and lines 401 and 402 credit the ARPANET's demonstration of 1969 with having "led to the Internet," which is a definitional disagreement under D1 and D1.7.

3.1 Line 401 of the timeline, under the heading "ARPANET," says: "ARPA research played a central role in launching the “Information Revolution,” including developing or furthering much of the conceptual basis for ARPANET, a pioneering network for sharing digital resources among geographically separated computers." Line 402 says: "Its initial demonstration in 1969 led to the Internet, whose world-changing consequences unfold on a daily basis today." Line 403 says: "A seminal step in this sequence took place in 1968 when ARPA contracted BBN Technologies to build the first routers, which one year later enabled ARPANET to become operational. | Read more about ARPANET"

3.2 BBN Report No. 4799, A History of the ARPANET: The First Decade, prepared for the Defense Advanced Research Projects Agency by Bolt Beranek and Newman Inc. and dated April 1981, gives the procurement on printed page III-17 in three sentences: "In July 1968, an RFQ for the network was mailed out to prospective bidders." "Final negotiations were carried out with two finalists, and one was chosen in the week before Christmas, 1968." "The contract was awarded and work began the second day of the New Year in 1969." On printed page III-35, the report names the contractor: "The contract to construct the IMP for the ARPANET was awarded to Bolt Beranek and Newman Inc. (BBN)." On printed page III-2, the report names the machines: "The IMPs (short for Interface Message Processors) are small, special-purpose computers connected to each other by telephone lines," and "The IMPs provide a communications subnetwork through which hosts communicate with each other." BBN Report No. 4799, April 1981.

3.3 Line 403 is false as written under F56. The contractor's own history dates the award of the contract to January 2, 1969, the second day of 1969, and not to 1968, in which year the contractor was chosen and no contract had yet been awarded. The same history names the contractor Bolt Beranek and Newman Inc., and this page did not read a document that dates the name "BBN Technologies." The words "the first routers" describe the IMPs, which RFC 1009 of June 1987 classes as packet-level routers inside one network and distinguishes from the gateways that join networks: "For example, Interface Message Processors (IMPs) are packet-level routers," and "In the Internet model, constituent networks are connected together by IP datagram forwarders which are called 'gateways' or 'IP routers'." Wikipedia Defines the Internet Protocol Suite: Disagreements | Network, Not Protocol, sections 2.0 and 3.0.

3.4 Mark Nichols disputes the credit in lines 401 and 402. The soft words are "played a central role in launching" at line 401 and "led to" at line 402, and the hard claim of line 402 is that the ARPANET's demonstration of 1969 produced the Internet. Under D1, the Internet, with a capital I, was born in 1991 on the Commercial Internet Exchange agreement announced on March 25, 1991 by General Atomics, Performance Systems International, Inc. and UUNET Technologies, Inc., and under D1.7 the words of lineage are not used on marknichols.com for the ARPANET. Line 402 is a definitional disagreement under D1 and D1.7, line 401 is a soft-verb credit that this page did not test, and lines 401, 402 and 403 are recorded at entries 10.4, 10.5 and 10.6 of Soft Verbs: A Running Register | Network, Not Protocol. Governing Definitions, D1 and D1.7.

3.5 This section counts line 403 among the false-as-written verdicts, records a definitional disagreement under D1 and D1.7 on line 402, and records line 401 as a soft-verb credit that this page did not test.

3.6 Corrected statement: The Advanced Research Projects Agency mailed its request for quotations for the ARPANET in July 1968, chose Bolt Beranek and Newman Inc. in the week before Christmas 1968, and awarded the contract to build the Interface Message Processors, the packet switches of the ARPANET's communications subnetwork, on January 2, 1969, and the ARPANET's first nodes operated in 1969. The ARPANET was a government research network whose users joined by permission, and the Internet, with a capital I, the publicly joinable network of networks of the registry lineage, was born in 1991.

4.0 Line 430 calls the ARPANET "the Internet’s precursor," which is a definitional disagreement under D1.7, because the word "precursor" places a government network whose users joined by permission in the lineage of the publicly joinable network of 1991.

4.1 Line 430 of the timeline, under the heading "First computer mouse," says that Douglas Engelbart of SRI "would later work on the DARPA-sponsored ARPANET project, the Internet’s precursor," and that he "invented the computer mouse."

4.2 Mark Nichols disputes the word "precursor." Under D1.7, the words of lineage are not used on marknichols.com for the ARPANET, and under D1 the Internet, with a capital I, was born in 1991. This is a definitional disagreement under D1.7. Governing Definitions, D1.7.

4.3 This section records a definitional disagreement under D1.7 and does not count line 430 among the false-as-written verdicts. This page makes no finding on the credit that line 430 gives Douglas Engelbart for the computer mouse.

4.4 Corrected statement: Douglas Engelbart of SRI, who later worked on the ARPANET project that the Advanced Research Projects Agency sponsored, a government research network whose users joined by permission, invented the computer mouse in an experiment funded by the Advanced Research Projects Agency.

5.0 Lines 80 and 81 say that the Memex program advanced "web searching on the Internet" and organized "a subset of the Internet," leading to the indexing of "web content," which is a definitional disagreement under D8, because the World Wide Web is an application and its content is not a part of the Internet.

5.1 Line 80 of the timeline, under the heading "Memex" for 2013, says: "DARPA rolled out its Memex program to move forward the state of the art in content indexing and web searching on the Internet." Line 81 says: "Over the next few years, the Memex program yielded new tools that enabled quick and thorough organization of a subset of the Internet, leading to more comprehensive and relevant domain-specific indexing of web content and domain-specific search capabilities."

5.2 Mark Nichols disputes the words "a subset of the Internet." Line 81 calls the material that Memex organized "a subset of the Internet" and, in the same sentence, "web content," so it treats the content of the World Wide Web as a part of the Internet. Under D8, the World Wide Web is an application, announced publicly on August 6, 1991, and the World Wide Web is not the Internet. This is a definitional disagreement under D8. Governing Definitions, D8.

5.3 This section records a definitional disagreement under D8 and does not count lines 80 and 81 among the false-as-written verdicts. This page makes no finding on the work of the Memex program.

5.4 Corrected statement: In 2013, the Defense Advanced Research Projects Agency began its Memex program to advance the indexing and searching of content on the World Wide Web, an application whose messages the networks of the Internet carry.

6.0 The timeline states several things correctly that this page checked, among them the conference and the year of Douglas Engelbart's demonstration of NLS and the agency's sponsorship of that work, and the documents that support each one are named here.

6.1 Line 410 says that Douglas Engelbart "unveiled NLS in San Francisco in December 1968, to a large audience at the Fall Joint Computer Conference." The conference and the year are supported. Engelbart and English's paper "A research center for augmenting human intellect" is printed in the proceedings with the running head "Fall Joint Computer Conference, 1968." The paper does not print the city or the month, and this page makes no finding on them.

6.2 Line 440 says that NLS "got off the ground thanks to funding from DARPA and the U.S. Air Force." The agency's sponsorship is supported at the scope of the paper of 1968. On page 395 the paper says: "Principal sponsors are: Advanced Research Projects Agency and National Aeronautics and Space Agency (NAS1-7897), and Rome Air Development Center F30602-68-C-0286." The paper names the Advanced Research Projects Agency first among its principal sponsors, and it also names the National Aeronautics and Space Agency, which line 440 does not name.

6.3 This page did not check the other lines of the timeline, which concern the agency's programs in weapons, aircraft, materials, satellites, robotics, computing and biology, and it makes no finding on them.

6.4 Section 6.0 credits the conference and the year of line 410 stated in 6.1 and the agency's sponsorship in line 440 stated in 6.2 as supported.

7.0 One statement of the "Innovation Timeline" of the Defense Advanced Research Projects Agency is false as written, the year of the contract for the ARPANET's first switches, six further findings record a documentary contradiction with the honored paper of 1974, definitional disagreements on the Internet, the ARPANET, the optional protocols TCP and IP and the World Wide Web, and an untested soft-verb credit, and the timeline is not carried on marknichols.com as an authority on the birth of the Internet.

7.1 The following statement of the timeline is false as written under F56. It is decided by the dated document named in the section cited.

1. Line 403 says that "in 1968" the agency "contracted BBN Technologies to build the first routers," while BBN Report No. 4799 of April 1981 says "The contract was awarded and work began the second day of the New Year in 1969" and names the contractor Bolt Beranek and Newman Inc., as section 3.0 records.

7.2 Six further findings record disagreements that are not counted among the false-as-written verdicts.

1. Line 125 marks "the 40th anniversary of the Internet" in 2009, which dates the Internet to 1969 and is a definitional disagreement under D1 and D1.7, as section 1.0 records.
2. Lines 358 and 359 describe protocols "for sending packets of data across the ARPANET" and credit the query of 1973 with "the Internet Protocol (IP)," while the paper of 1974 concerns "network interconnection" through the GATEWAY and never prints "Internet," which is a documentary contradiction, as section 2.0 records.
3. Lines 358 and 360 place the query of 1973 in "the development of the Internet" and call the protocols "a mainstay of the Internet’s underlying technical foundation," which is a definitional disagreement under D1, D6 and the protocol-credit ruling of September 24, 2026, as section 2.0 records.
4. Line 402 says that the ARPANET's demonstration of 1969 "led to the Internet," which is a definitional disagreement under D1 and D1.7, and line 401 says that the agency's research "played a central role in launching" the "Information Revolution," which is a soft-verb credit that this page did not test, as section 3.0 records.
5. Line 430 calls the ARPANET "the Internet’s precursor," which is a definitional disagreement under D1.7, as section 4.0 records.
6. Line 81 calls web content "a subset of the Internet," which is a definitional disagreement under D8, as section 5.0 records.

7.3 Under D12, contemporaneous primary documents control over retrospective accounts, and this page has decided each finding by the following documents.

1. BBN Report No. 4799, A History of the ARPANET: The First Decade, prepared for the Defense Advanced Research Projects Agency by Bolt Beranek and Newman Inc. and dated April 1981, records the procurement of 1968 and the award of the contract on January 2, 1969.
2. Vinton G. Cerf and Robert E. Kahn's "A Protocol for Packet Network Intercommunication," published in IEEE Transactions on Communications in May 1974, describes a "transmission control program (TCP)" within each host and assigns the interconnection of networks to the GATEWAY.
3. RFC 1009 of June 1987, Requirements for Internet Gateways, by R. Braden and J. Postel, distinguishes the IMPs, "packet-level routers" within one network, from the gateways that join networks.
4. The press release of March 25, 1991, issued by General Atomics, Performance Systems International, Inc. and UUNET Technologies, Inc., announced the first Commercial Internet Exchange.

The timeline is the agency's own account of its own achievements, with no author and no date, and no line of it is carried on marknichols.com as controlling. Governing Definitions, D12.

7.4 The findings on this page are open to challenge on the terms stated at F40 of The Governing Definitions and Controlling Facts of Telecommunications Internetworking. A challenger who holds that a finding on this page is wrong states the competing claim in one sentence, names the document that carries it and the document's date, and submits both as F40 directs. A challenge submitted with its document is answered on this page, and a challenge submitted without a document is an opinion and is heard as one.

8.0 This section holds Exhibit A, the numbered text of the "Innovation Timeline" of the Defense Advanced Research Projects Agency, as read on November 13, 2026.

8.1 Exhibit A reproduces the text of the timeline line by line, in the order the timeline prints it, so that every line number cited on this page can be read in place.

1. Exhibit A begins with the timeline's heading, "Innovation Timeline," and ends with the last entry of the timeline, for 1957.
2. Exhibit A omits the navigation of darpa.mil, the timeline's breadcrumb, its repeated "Back to top" links and the contact form that follows the timeline.
3. Exhibit A prints every line as the timeline prints it, including the link labels that the timeline prints at the ends of its entries, such as "| Read more about ARPANET," and 28 em dashes in 16 of its lines, which are the timeline's characters and not this site's. The timeline prints a non-breaking space in four of its lines, at lines 13, 17, 29 and 456, and Exhibit A prints each of them as an ordinary space.

The text is quoted from the Defense Advanced Research Projects Agency, an agency of the United States government, for the purpose of this examination. Defense Advanced Research Projects Agency, "Innovation Timeline".

1. Innovation Timeline

2. Redefining Possible

3. Since 1958, DARPA has been an engine of innovation serving national defense and the U.S. warfighter.

4. From satellites and stealth aircraft to flat screens and Siri, our research challenges assumptions to prepare for the battlefield of tomorrow, while generating significant societal and economic advances.

5. DARPA has pushed, and will continue to push, the boundaries of technological possibility. See the dreams we turned to reality.

6. Use the filters to narrow results by research topic or year. Also, search by keyword for specific initiatives.

7. 2025

8. F-47 airplane

9. Under research and development contracts with DARPA, Boeing and Lockheed Martin designed two X-planes as risk reduction for the Next Generation Air Dominance (NGAD) Platform. These aircraft first flew in 2019 and 2022, logging several hundred hours each.

10. As reflected in the statement from Chief of Staff of the Air Force Gen. David Allvin: “For the past five years, the X-planes for this aircraft have been quietly laying the foundation for the F-47 — flying hundreds of hours, testing cutting-edge concepts, and proving that we can push the envelope of technology with confidence.” | Read more about the F-47

11. 2023

12. ACE

13. The Air Combat Evolution (ACE) program achieved the first-ever in-air tests of AI algorithms autonomously flying an F-16 against a human-piloted F-16 in within-visual-range combat scenarios (sometimes referred to as “dogfighting”).

14. In flight, the ACE AI algorithms controlled a specially modified F-16 test aircraft known as the X-62A, or VISTA (Variable In-flight Simulator Test Aircraft), at the Air Force Test Pilot School at Edwards Air Force Base, California, where all demonstrations of autonomous combat maneuvers took place in 2023 and continued in 2024. | Read more about ACE

15. 2022

16. ALIAS

17. The Aircrew Labor In-Cockpit Automation System (ALIAS) program completed a first-ever flight of a UH-60A Black Hawk helicopter without anyone onboard.

18. Sikorsky, a Lockheed Martin company, completed 30 minutes of uninhabited flight with the optionally piloted vehicle (OPV) over the U.S. Army installation at Fort Campbell, Kentucky, in February 2022. | Read more about ALIAS

19. 2021

20. Subterranean Challenge

21. The Subterranean (SubT) Challenge seeks to better equip warfighters and first responders to explore uncharted underground environments that are too dangerous, dark, or deep to risk human lives. Participating teams will deploy autonomous systems to map, navigate, and search underground tunnel, urban, and cave spaces. | Read more about the Challenge

22. 2020

23. DARPA Launch Challenge

24. DARPA's Launch Challenge came to a close with many lessons learned, including the ability to achieve launch-readiness with minimal infrastructure and little knowledge of launch conditions, but there was no winner.

25. Despite the absence of the desired endpoint in 2020 — a successful launch program — managers consider the DARPA Launch Challenge as having met many of its goals. | Read more about the Challenge

26. 2019

27. FETT

28. After three months of reviewing more than 13,000 hours of hacking labor conducted by more than 580 cybersecurity researchers, DARPA announced in January 2021, that its Finding Exploits to Thwart Tampering (FETT) Bug Bounty validated the security-enhancing efficacy of newly designed hardware architectures developed under the agency’s System Security Integration Through Hardware and Firmware (SSITH) program.

29. From July-October 2020, DARPA held its first bug bounty program – a crowdsourced, red team exercise used to evaluate and analyze a technology’s defenses. DARPA partnered with the Department of Defense’s Defense Digital Service (DDS) — a self-described SWAT team within the DoD — and Synack, a crowdsourced security platform on this effort. | Learn more about FETT

30. Revolutionary radiation-detection capabilities

31. The goal of the SIGMA program, which began in 2014, was to develop and test low-cost, high-efficiency radiation sensors that detect gamma and neutron radiation and to network them via smartphones.

32. A capstone demonstration in December 2019 with the Port Authority of New York and New Jersey (Port Authority) culminated a five-year effort to develop and deploy an automated, high-performance, networked radiation detection capability for counterterrorism and continuous city-to-region scale radiological and nuclear threat monitoring. | Read more about SIGMA

33. 2018

34. Spectrum Collaboration Challenge

35. In 2016, DARPA rolled out the Spectrum Collaboration Challenge (SC2), with the goal of ensuring that the exponentially growing number of military and civilian wireless devices have ready access to increasingly crowded electromagnetic spectrum when needed.

36. SC2 was designed to encourage researchers to develop smart systems that collaboratively, rather than competitively, adapt in real time to the fast-changing, congested spectrum environment—redefining the conventional spectrum management roles of humans and machines to maximize the flow of radio frequency (RF) signals. | Read more about the Challenge

37. Sea Hunter transfers to Navy

38. DARPA took its Anti-Submarine Warfare (ASW) Continuous Trail Unmanned Vessel (ACTUV) program to one of the best finish lines the Agency knows of an official transfer of a technology to a follow-on steward of development or to an end user in the field.

39. In this case, following a period of open-water tests of the programs demonstration vessel dubbed Sea Hunter to the Office of Naval Research (ONR), the latter organization officially took over responsibility of developing the revolutionary prototype vehicle as the Medium Displacement Unmanned Surface Vehicle (MDUSV). | Read more about ACTUV

40. 2017

41. AI Next

42. DARPA announced a multi-year investment of more than $2 billion on artificial intelligence research and development in a portfolio of some 50 new and existing programs collectively called the “AI Next” campaign.

43. AI Next builds on AI technology development at DARPA extending back to the 1960s when J.C.R. Licklider, one of DARPA’s most storied and visionary program managers, oversaw formative research into the symbiosis of human and artificial intelligence. | Read more about AI Next

44. JUMP

45. In collaboration with the non-profit Semiconductor Research Corporation (SRC), DARPA recruited a consortium of cost-sharing industry partners to fund and oversee the Joint University Microelectronics Program (JUMP).

46. The goal is to catalyze innovations for increasing the performance, efficiency, and overall capabilities of broad classes of electronics systems for both commercial and military applications. | Read more about JUMP

47. Service Academies Swarm Challenge

48. To help make effective swarm tactics with small unmanned aerial vehicles (UAVs) and other robots a reality, DARPA planned and organized the Service Academies Swarm Challenge, a collaboration between the Agency and the three U.S. military Service academies — the U.S. Military Academy, the U.S. Naval Academy, and the U.S. Air Force Academy.

49. An experiment at its heart, the research effort was designed to encourage students to develop innovative offensive and defensive tactics for swarms of small UAVs. | Read more about the Challenge

50. Bay Area SDR Hackfest

51. The increased use of wireless and internet-enabled devices — from smartphones and computers to cars and home appliances — and the data they generate are creating opportunities and challenges for the defense and commercial sectors.

52. To help explore and better understand the complex relationship created by the intersection of physical and cyber technology within the ever more congested electromagnetic spectrum, DARPA embarked on a year-long effort to build an engaged community of engineers and scientists operating within relevant technical areas. | Read more about the event

53. Adept/P3

54. As part of the ADEPT program in 2011, DARPA began investing in nucleic acid vaccines. The hypothesis was that rather than delivering antigens to the immune system, researchers could deliver genes that encode the antigen and allow the human body to produce the antigen from its own cells, triggering a protective immune response.

55. In December 2020, former ADEPT performer Moderna’s RNA vaccine received emergency use authorization from the FDA for the prevention of COVID-19.

56. In 2017, DARPA initiated the Pandemic Prevention Platform (P3) program aimed squarely at the rapid discovery, testing, and manufacture of antibody treatments to fight any emerging disease threat. P3 convincingly demonstrated how to find and test antibodies in just a few months (versus years), using influenza, Zika, and MERS as test cases.

57. As the COVID-19 outbreak began early in 2020, P3 research pivoted to address the novel coronavirus. | Read more

58. 2015

59. Cyber Grand Challenge

60. The 21st century has brought with it the ever more urgent need for automated, scalable, machine-speed vulnerability detection and patching as more and more systems — from household appliances to major military platforms — get connected to, and become dependent upon, the internet.

61. Finding and countering bugs, hacks, and other cyber infection threats have effectively been artisanal: professional bug hunters, security coders, and other security pros work endless hours, searching millions of lines of code to find and fix vulnerabilities that those with ulterior motives can exploit. This is a sluggish process that can no longer can keep pace with the relentless stream of threats.

62. To help overcome these challenges, DARPA in 2014 launched the Cyber Grand Challenge, a competition to create automatic defensive systems capable of reasoning about flaws, formulating patches and deploying them on a network in real time. | Read more about the Challenge

63. SST Transition

64. At a mountaintop event in New Mexico, DARPA handed off ownership of its Space Surveillance Telescope (SST) from an Agency-led design and construction program to ownership and operation by U.S. Air Force Space Command (AFSPC), which operate the telescope in Australia jointly with the Australian government.

65. SST has moved space situational awareness from seeing only a few large objects at a time through the equivalent of a drinking straw, to a “windshield” view with 10,000 objects at a time, each as small as a softball.

66. SST can search an area larger than the continental United States in seconds and survey the entire geosynchronous belt within its field of view — one quarter of the sky — multiple times in one night. | Read more about SST

67. 2014

68. CHIKV Challenge

69. To accelerate the development of new infectious disease forecasting methods, DARPA launched its CHIKV Challenge. The chikungunya virus (CHIKV) first appeared in the Americas in 2013 but was quickly spreading and by mid-2015, the Pan-American Health Organization (PAHO) had tallied close to 1.4 million suspected cases and more than 33,000 confirmed.

70. Thirty-eight teams from around the world vied to develop the most accurate predictions of CHIKV cases for all Western Hemisphere countries and territories between September 2014 and March 2015. | Read more about the Challenge

71. Spectrum Challenge finals

72. In 2014, 15 teams from around the United States participated in the final event of the DARPA Spectrum Challenge, a competition designed to encourage development of programmable radios that can deliver high-priority transmissions in congested and contested spectrum environments.

73. This event tested conditions directly applicable to military communications and demonstrated that radios can learn to coexist and communicate reliably through autonomous sensing and adaptation paving the way for new spectrum-sharing applications for the Department of Defense and commercial industry. The final event took place at DARPAs offices in Arlington, Virginia. | Read more about the Spectrum Challenge

74. EXACTO Live-fire testing

75. The Extreme Accuracy Tasked Ordnance (EXACTO) program conducted the first successful live-fire tests demonstrating in-flight guidance of .50-caliber bullets. EXACTO rounds maneuvered in flight to hit targets that were offset from where the sniper rifle was aimed.

76. EXACTO’s specially designed ammunition and real-time optical guidance system help track and direct projectiles to their targets during flight by compensating for weather, wind, target movement, and other factors that could impede successful hits.

77. Follow-on work in the EXACTO program included developing new approaches and advanced capabilities to improve the day- and night-time range and accuracy of sniper systems beyond the current state of the art. | Read more about EXACTO

78. 2013

79. Memex

80. DARPA rolled out its Memex program to move forward the state of the art in content indexing and web searching on the Internet.

81. Over the next few years, the Memex program yielded new tools that enabled quick and thorough organization of a subset of the Internet, leading to more comprehensive and relevant domain-specific indexing of web content and domain-specific search capabilities.

82. Memex quickly proved its value in efforts to counter human trafficking. Human trafficking is a line of business with significant web presence to attract customers and is relevant to many types of military, law enforcement, and intelligence investigations. | Learn more about the Memex program

83. STARnet established

84. DARPA and key companies from the semiconductor and defense industries established the Semiconductor Technology Advanced Research Network, or STARnet.

85. This effort, which lasted until 2017 when it was superseded by a similar program known as JUMP, supported large university communities to look beyond the current evolutionary directions in microelectronics research and development.

86. This community of leading academics was supported by resources and expertise of DARPA and participating companies, including at least $40 million each year in basic research funding. | Read more about the program

87. LS3 Pack Mule

88. To help alleviate physical weight on troops, DARPA developed a four-legged robot, the Legged Squad Support System (LS3), to integrate with squads of Marines or soldiers.

89. The LS3 program goal was to develop a robot that could go through the same terrain the squad goes through without hindering the squads mission. The robot could also serve as a mobile auxiliary power source to the squad, so troops could recharge batteries for radios and handheld devices while on patrol.

90. In January 2012, the LS3 prototype completed its first outdoor assessment, demonstrating mobility by climbing and descending a hill and exercising its perception capabilities. A two-year, platform-refinement test cycle began in July 2012, with U.S. Marine Corps and U.S. Army involvement, culminating in a capstone exercise where LS3 embedded with Marines conducting field exercises. | Read more about LS3

91. Atlas Robot Debuts

92. The Atlas disaster-response robot made its public debut on July 11, 2013.

93. In its original form, the 6’2”, 330-pound humanoid robot — developed for DARPA by Boston Dynamics of Waltham, Massachussets — was capable of a range of natural movements. A tether connected the robot to both an off-board power supply and computer through which a human operator issued commands.

94. Atlas was created for use in the DARPA Robotics Challenge (DRC), a prize competition intended to speed the development of advanced robotic hardware, software, sensors and control interfaces so that robots might assist humans in responding to future natural and man-made disasters.

95. Seven of the Atlas robot platforms were presented to qualifying teams from an early, simulation-based round of the DRC that focused on software development. At the time of its debut, ATLAS was one of the most advanced humanoid robots ever built, but it was essentially a physical shell for the software brains and nerves that the teams developed.

96. The teams used their Atlas robots to compete in the live DRC Trials in December 2013, where they attempted to guide the robots through a series of physical tasks representative of what might be encountered in disaster zones.

97. In preparation for the June 2015 DRC Finals in Pomona, Calif., DARPA called on Boston Dynamics to improve Atlas’ power efficiency, switch to on-board power and wireless communication, strengthen its limbs and improve its durability, and update its appearance. These tasks were completed in mid-2015. | Read more about Atlas

98. 2012

99. Blast Gauge

100. Under a DARPA contract, the Rochester Institute of Technology (RIT) developed the Blast Gauge, a small device worn by warfighters to measure blast exposure and cue medics for initial response.

101. As of February 2013, more than 11,000 personnel deployed in combat wore DARPA-designed prototype Blast Gauges.

102. DARPA was using the data compiled from these devices to understand blast propagation, provide new insights into sources and causes of traumatic brain injury, and ultimately develop technologies that help minimize exposure and improve medical care. | Read more about the Blast Gauge

103. ICECool

104. DARPA introduced the Intrachip/Interchip Enhanced Cooling (ICECool) program in June 2012 to explore embedded thermal management. The premise of ICECool was to bring microfluidic cooling inside the substrate, chip, or package, including thermal management in the earliest stages of electronics design.

105. The program helped create a research community intent on developing techniques and technologies for including new thermal control innovations in the overall quest to continue progress in electronics technologies. | Read more about ICECool

106. 2011

107. Gallium nitride transitions

108. For years, DARPA and its Service partners pursued the technically daunting task of developing high-power-density, wide-band-gap semiconductor components in the recognition that, whatever the end-state task, U.S. forces would need electronics that could operate and engage at increasing range.

109. The result was a series of fundamental advances involving gallium nitride-enabled arrays, which now provide significant benefits in a wide range of applications in the national security domain. | Read more about gallium nitride transitions

110. Falcon HTV-2

111. DARPA’s Falcon Hypersonic Technology Vehicle 2 (HTV-2) program was a multiyear research and development effort to increase the technical knowledge base and advance critical technologies to make long-duration hypersonic flight a reality.

112. HTV-2 flew its maiden flight on April 22, 2010, collecting nine minutes of unique flight data, including 139 seconds of Mach 22 to Mach 17 aerodynamic data.

113. The booster system Falcon 9 was another historical aspect of the program. In 2011, it was certified to launch DoD’s highly valuable payloads – the first commercial vendor for such a service. | Read more about HTV-2

114. 2010

115. Radar for UAVs

116. In collaboration with the Department of Defense’s Joint Improvised Explosive Device Defeat Organization (JIEDDO), DARPA initiated the Vehicle and Dismount Exploitation Radar (VADER) program to design and deploy a radar system for unmanned aerial vehicles (UAVs) or small manned aircraft.

117. Developed for DARPA by Northrop Grumman Electronic Systems, VADER provided synthetic aperture radar and ground moving-target indicator data to detect, localize, and track vehicles and dismounted troops.

118. In February 2011, VADER’s success led the U.S. Air Force to initiate the Dismount Detection Radar (DDR) program to develop and integrate VADER-like capabilities onto UAV Reapers. In July 2012, Raytheon was selected as lead DDR program developer. | Read more about radar for UAVs

119. 2009

120. High-altitude LIDAR

121. Leveraging past DARPA developments in laser-based versions of RADAR — known as LIDAR, short for light detection and ranging — the High-Altitude LIDAR Operations Experiment (HALOE) provided unprecedented access to high-resolution 3-D geospatial data.

122. First deployed to Afghanistan in 2010, HALOE was one of several DARPA advances directly supporting the warfighter that earned the Agency the Joint Meritorious Unit Award from the Secretary of Defense in 2012. | Read more about high-altitude LIDAR

123. 2008

124. DARPA Network Challenge

125. To mark the 40th anniversary of the Internet, DARPA announced the DARPA Network Challenge, a competition that explored the roles that the Internet and social networking play in the timely communication, wide-area team-building, and urgent mobilization required to solve broad-scope, time-critical problems.

126. The Challenge called for competitors to be the first to submit the locations of 10 moored, eight-foot, red weather balloons at 10 fixed and readily visible locations in the continental United States.

127. On Dec. 5, 2009, in less than seven hours, the Massachusetts Institute of Technology (MIT)’s Red Balloon Challenge team found all 10 balloons. | Read more about the Challenge

128. 2007

129. Massive DATA analysis

130. With the goal of developing analysis techniques for massive data sets, DARPA rolled out the Topological Data Analysis (TDA) program, which ran from 2004 to 2008.

131. Like many other programs, this one spawned a commercial firm, in this case a software firm that remained in business at the posting of this timeline in 2018. | Read more about massive DATA analysis

132. DARPA Urban Challenge

133. Building on the success of the 2004 and 2005 Grand Challenges, the DARPA Urban Challenge required teams to build an autonomous vehicle capable of driving in traffic, performing complex maneuvers such as merging, passing, parking, and negotiating intersections.

134. This event was groundbreaking as the first time autonomous vehicles have interacted with both manned and unmanned vehicle traffic in an urban environment. | Read more about the Challenge

135. Autonomous high-altitude refueling

136. In an in-air demonstration in 2007, DARPA teamed up with NASA to show that high-performance aircraft can easily perform automated refueling from conventional tankers.

137. The 2007 demonstration was not entirely automated, however: a pilot was on board to set conditions and monitor safety during autonomous refueling operations. Building upon this foundation, DARPA, by way of its Autonomous High-Altitude Refueling program, demonstrated for the first time the ability to safely conduct fully autonomous aerial refueling of unmanned air vehicles (UAVs) in challenging high-altitude flight conditions. | Read more about autonomous high-altitude refueling

138. 2006

139. Orbital Express

140. The goal of the Orbital Express Space Operations Architecture program was to validate the technical feasibility of robotic, autonomous on-orbit refueling and reconfiguration of satellites to support a broad range of future U.S. national security and commercial space programs.

141. Refueling satellites would enable them to frequently maneuver to improve coverage, improve survivability, as well as extend satellite lifetime. Electronics upgrades on-orbit would provide regular performance improvements and dramatically reduce the time to deploy new technology. | Read more about Orbital Express

142. LUKE arm | Revolutionizing prosthetics

143. The LUKE arm was developed by inventor Dean Kamen and his colleagues at DEKA Research & Development Corp. as part of DARPA’s Revolutionizing Prosthetics program with additional funding from the U.S. Army Medical Research and Materiel Command.

144. Launched in 2006, DARPA’s program began with a radical goal: develop an advanced electromechanical prosthetic upper limb with near-natural control that would dramatically enhance independence and quality of life for amputees. | Read more about revolutionizing prosthetics

145. 2005

146. MiTex

147. Boosted into geosynchronous orbit on June 21, 2006 aboard a Delta II rocket, the Microsatellite Technology Experiment (MiTEx) technology demonstration investigated and demonstrated advanced high-payoff technologies from a variety of potential candidates, including lightweight power and propulsion systems, avionics, structures, commercial off-the-shelf (COTS) components, advanced communications, and on-orbit software environments.

148. MiTEX flight-tested a new, experimental upper stage, and demonstrated small COTS technologies to support a fast-paced, low-cost, lab-like, build-to-launch satellite approach in a shared industry/government environment. | Read more about MiTex

149. Chip-scale atomic clock

150. The Chip-Scale Atomic Clock (CSAC) program created ultra-miniaturized, low-power, atomic time and frequency reference units.

151. The development of CSAC enabled ultra-miniaturized and ultra-low power atomic clocks for high-security Ultra High Frequency (UHF) communication and jam-resistant GPS receivers. The use of CSAC technology can greatly improve the mobility and robustness of any military system or platform with sophisticated UHF communication and/or navigation requirements.

152. This program resulted in commercially available CSAC technology. The CSAC program achieved a 100-fold size reduction while consuming 50 times less power than traditional atomic clocks. | Read more about CSAC

153. A-160

154. DARPA paved the way for extended-range unmanned vertical takeoff and landing (VTOL) operations by sponsoring development of another Hummingbird: the A-160, a long-endurance, high-speed unmanned helicopter that flew for 18.7 hours and in 2008 set a world record for endurance in its weight class.

155. The A-160 was part of research pursued by DARPA and the Services to produce a range of autonomous platforms that could team with people to create a more capable, agile, and cost-effective force. | Read more about the A-160

156. BigDog

157. With its sights on robotic pack mules to help warfighter in operations, DARPA initiated a program that yielded BigDog. The robots on-board computer controls locomotion, processes sensors, and handles communications with the user.

158. BigDog's control system keeps it balanced, manages locomotion on a wide variety of terrain, and does navigation. Sensors for locomotion include joint position, joint force, ground contact, ground load, a gyroscope, LIDAR, and a stereo vision system. Other sensors focus on the internal state of BigDog, monitoring the hydraulic pressure, oil temperature, engine functions, battery charge, and others.

159. In demonstrations, BigDog ran at 10 kmh, climbed slopes up to 35 degrees, walked across rubble, climbed muddy hiking trails, walked in snow and water, and carried up to 150kg loads.

160. Development of the original BigDog robot was funded by DARPA. Work to add a manipulator and do dynamic manipulation was funded by the Army Research Laboratory's RCTA program. | Read more about BigDog

161. 2004

162. Grand Challenge

163. DARPA ran its pathbreaking Grand Challenge with the goal of spurring on American ingenuity to accelerate the development of autonomous vehicle technologies that could be applied to military requirements. No team entry successfully completed the designated DARPA Grand Challenge route from Barstow, Calif., to Primm, Nevada, on March 13, 2004.

164. The event offered a $1 million prize to the winner from among 15 finalists that emerged from a qualifying round at the California Speedway, but the prize went unclaimed as no vehicles were able to complete the difficult desert route. | Read more about the Challenge

165. 2003

166. Quantum key distribution network

167. As part of the then-3-year-old Quantum Information Science and Technology (QuIST) program, DARPA-funded researchers established the first so-called quantum key distribution network, a data-encryption framework for protecting a fiber-optic loop that connects facilities at Harvard University, Boston University, and the office of BBN Technologies in Cambridge, Mass.

168. Though only a step toward functional and practical quantum encryption systems, it represented the sort of community-building and thought leadership that it takes to move futuristic ideas, such as ones based on quantum mechanical processes, toward operational and current realities.

169. 2002

170. Personal Assistant That Learns (PAL)

171. Through its Personalized Assistant that Learns (PAL) program, DARPA created cognitive computing systems to make military decision-making more efficient and more effective at multiple levels of command; reduce the need for large command staffs; and enable smaller, more mobile, and less vulnerable command centers.

172. Advances stemming from the agency’s PAL program were applied not only for military users but also to enable voice-based interaction with civilian handheld devices.

173. Learn more about PAL

174. High-productivity computing

175. DARPA established its High-Productivity Computing Systems (HPCS) program, with a goal of revitalizing supercomputer research and markets, and incubating a new breed of fast, efficient, easier-to-use and affordable machines. DARPA made initial grants to five key players: IBM, Cray, Hewlett-Packard, Silicon Graphics, and Sun Microsystems.

176. The companies were given 18 months to produce concept studies for next-generation supercomputers.

177. Though the grant amounts were modest – about $3 million each – the infusion essentially represented the end of a long drought in government investment in the field.

178. 2000

179. PicoSAT

180. DARPA initiated a microsatellite program featuring extremely small microelectromechanical systems (MEMS) radio frequency (RF) switches. The first picosat mission, launched in January 2000, demonstrated MEMS RF switches operating on a pair of tethered satellites, each one weighing just over one pound.

181. The program demonstrated how constellations of small satellites could work together in the future with dramatically reduced size and power requirements.

182. 1999

183. Miniature Air-Launched Decoy

184. In 1999, the first flight test associated with the Miniature Air-Launched Decoy (MALD) program, which begun in 1995, took place. With origins in the tradition of metal radar-confusing chaff dropped from aircraft, the point of MALD was to develop a small, inexpensive decoy missile to counter air defense measures.

185. Read more about MALD

186. 1997

187. Head-mounted displays

188. With an eye on the future of wearable computers and other technologies that can assist warfighters in daunting acts of multi-tasking, DARPA initiated programs to develop head-mounted displays to enable soldiers to view information with unprecedented ease and efficiency.

189. Read more about head-mounted displays

190. 1996

191. ARPA renamed DARPA, again

192. With a desire by national leadership to re-emphasize the Agency’s focus on defense matters over commercial ones, ARPA regains its D for Defense to again become DARPA.

193. Geographic Synthetic Aperture Radar

194. The Geographic Synthetic Aperture Radar (GeoSAR) program was an airborne radar-based project for simultaneously mapping foliage canopies along with the terrain underneath the canopies.

195. Begun in 1996, the program outfitted a commercial Gulfstream II business jet with a dual-band (P-band and X-band), dual-sided, interferometric mapping radar, designed to efficiently map wide-areas in a single pass of the aircraft.

196. Read more about GeoSAR

197. Schottky IR Imager

198. In Desert Storm, warfighters use such imagers to locate tanks and other military equipment buried in the sand. To continue to advance the technology, DARPA-funded R&D for a new generation of IR imagers in the mid-90s.

199. One of the resulting new technologies, known as the Schottky IR Imager mated Schottky barriers — devices that control the direction of electronic flow with a designed interface between a metal and a semiconductor — to standard silicon technology, creating a more reliable and cost effective IR imager that delivered a much higher image resolution than previous generations.

200. Read more about the Schottky IR Imager

201. 1995

202. X-31

203. The X-31 experimental aircraft was designed and built by Rockwell and Messerschmitt-Bölkow-Blohm (MBB), as part of a joint U.S. and German Enhanced Fighter Maneuverability program to improve pilots’ abilities to control the aircraft’s pitch and yaw with more finesse than was possible in most conventional fighters.

204. DARPA joined the cause by sponsoring tests of the X-31. During a test on November 6, 1992, one of the two X-31s that were built in the program, achieved controlled flight at a 70° angle of attack. On April 29, 1993, the second X-31 successfully executed a swift, minimum-radius, 180° turn using a post-stall maneuver, a maneuver well beyond the ability of conventional aircraft.

205. Of the two aircraft, one survived to the conclusion of the X-31 program in June 1995.

206. Read more about the X-31

207. 1994

208. Sensor-Fuzed Weapon

209. In 1994, the Sensor-Fuzed Weapon entered the Air Force Inventory.

210. The weapon is an air-to-ground munition designed to meet the Air Force requirement for a general-purpose weapon that provides multiple kills per pass; can be employed over a wide area; functions under adverse weather conditions, at night, in an electronic countermeasures environment; and can be deployed from frontline fighters and bombers.

211. Read more about the Sensor-Fuzed Weapon

212. Microelectromechanical Systems

213. For many years beginning in 1994, DARPA provided substantial funding in the then emergent arena of micro-electro-mechanical systems (MEMs).

214. With lineage in microelectronics technology, MEMs researchers cleverly adapted standard semiconductor-fabrication methods to fabricate miniature mechanical structures such as flexible membranes, cantilevers, and even trains of interdigitated gears, and integrated these with electronics to create a menagerie of MEM systems.

215. Read more about microelectromechanical systems

216. 1993

217. DARPA becomes ARPA

218. In character with President Clinton’s emphasis on economic growth, the Department of Defense restored DARPA’s original name, ARPA, to, in the words of a letter distributed by William Perry, then Deputy Secretary of Defense, “to expand the agency’s mission to pursue imaginative and innovative research and development projects having a significant potential for both military and commercial (dual-use) applications.”

219. In 1996, the Agency again would pick up that D, for Defense, and become known once again as DARPA.

220. Spintronics

221. In 1993, program manager Stuart Wolf initiated what become a sustained sequence of programs that helped develop the foundations of magnetics-based and quantum microelectronics. The first program, Spintronics, catalyzed the development of non-volatile magnetic memory (MRAM) devices and led to SPiNS, a program that sought to develop spin-based integrated circuits (ICs).

222. During this period, DARPA started a dozen related programs in the field of magnetics and electron spin for microelectronics that collectively helped launch increasingly diverse and complex technologies, including ones that led to astoundingly dense data storage.

223. 1992

224. Non-Penetrating Periscope

225. In response to a call by Congress to establish a program to develop and efficiently transfer new hull, mechanical, and electrical technologies outside of normal U.S. Navy research and development channels, DARPA answered with the Advanced Submarine Technology (SUBTECH) program.

226. Among ten technology demonstrations that successfully transitioned from the program to the Navy between 1989 and 1994 was the Non-Penetrating Periscope (NPP).

227. Read more about NPP

228. Brilliant Anti-Tank Munition

229. DARPA and the U.S. Army’s Fort Belvoir Research, Development and Engineering Center ran a series of concept studies in the early 1970s to define requirements for an anti-tank weapon referred to as the Terminally Guided Anti-Armor Indirect Fire Weapon System.

230. Under DARPA’s wing, that morphed into the Brilliant Anti-Tank Munition (BAT), a terminally guided anti-armor munition originally intended to be carried aboard the TriService Standoff Attack Missile.

231. Read more about BAT

232. 1991

233. Radar mapping

234. In the early 1990s, DARPA developed an airborne, all-weather, radar-based mapping capability that generated maps of the terrain with an accuracy to within six feet of elevation and that could do so day or night, and in adverse weather conditions, such as thick cloud cover or rain.

235. Under DARPA sponsorship, the Environmental Research Institute of Michigan (ERIM) carried out the project and mounted an interferometric radar system on a Learjet 36A to collect data, which was then processed on the ground into digital elevation models.

236. Read more about radar mapping

237. Short Takeoff Vertical Landing

238. DARPA began working with the U.K. Ministry of Defense (MoD) to develop a follow-on supersonic generation to the AV-8 Harrier, a pioneer aircraft for short takeoff and landing (STOL) capabilities. The international program that emerged from this intention, the Advanced Short Takeoff Vertical Landing (ASTOVL), expired in 1991, but various component efforts toward the same end continued.

239. DARPA worked with the U.S. Navy to establish a development program for an STOVL Strike Fighter with capabilities specified by the Navy in 1988. The program evolved toward an aircraft that could build on much of the design base for the Air Force F-16.

240. Uncooled IR detection

241. DARPA proved that practical, uncooled infrared detector technology was possible under the Low Cost, Uncooled Sensor Program (LOCUSP) of the late 1980s. Previous generations of IR sensors used cryogenics to cool the detector materials and reduce system noise.

242. Read more about LOCUSP

243. Cermet body armor

244. In addition to supporting advanced materials development since its early years, DARPA has at times been called upon to identify technologies for specific near-term applications. One of these tasks occurred for Operation Desert Storm (1991-1992) when ground forces experienced a critical need for more effective armor.

245. The DARPA solution in this case, particularly for roof protection for the U.S. Marine Corps’ Light Armored Vehicles (LAVs) against artillery, was to ask the Lanxide Corporation to modify its cermet (ceramic/metallic) process and to work with a partner Foster Miller to produce appliqué armor.

246. Read more about cermet body armor

247. 1989

248. Vertical-Cavity Surface-Emitting Lasers

249. First proposed in 1977 by Japanese researcher Kenichi Iga, the vertical-cavity surface-emitting laser (VCSEL) would have characteristics similar to light-emitting diodes and could be coupled to optical fibers. Over the next decades, a small research community began chipping away at the technical challenges it would take to produce practical VCSEL devices.

250. But not until 1989 when DARPA began a series of programs that would support, among other technology goals, the government-wide High Performance Computing and Communications (HPCC) Initiative, did the financial and institutional resources become adequate to move technical promise toward technological reality.

251. Read more about VCSELs

252. High Definition Systems

253. The high-definition systems program was started in 1989 as the High definition TV program. It was renamed High Definition Systems in 1990 and continued until 1993.

254. The program supported work on display-related technologies, including materials and manufacturing techniques. One novel technology supported by the program, digital mirror projection technology, became a commercial success in electronic projectors, and led to an Emmy Award and an Oscar Technical Achievement Award.

255. RF-wafer scale integration

256. The microelectronics revolution led to a ubiquity of fingernail-sized chips bearing integrated circuits made of large numbers of tiny transistors, interconnects, and other miniaturized components and devices.

257. DARPA challenged the research community to achieve the tight integration of chips to the scale of the entire semiconductor wafer from which, normally, hundreds of chips would be diced and then packaged into separate components of electronic systems.

258. Read more

259. Taurus launch vehicle

260. DARPA initiated a Small Standard Launch Vehicle (SSLV) program that led to the Taurus, a launch vehicle designed to supply the Department of Defense with quick-response, low-cost launch of tactical satellites from ground facilities.

261. The initial DARPA model was first test launched in 1989 and first used operationally in 1994. The prime contractor subsequently offered the vehicle in four versions.

262. 1988

263. UAVs

264. Under a joint program (Teal Rain) with the U.S. Navy, DARPA funded the development of the first endurance unmanned aerial vehicle (UAV), Amber, which in 1988 flew for more than 38 straight hours and reached an altitude of 25,000 feet.

265. Read more about UAVs

266. Unmanned Undersea Vehicle

267. Full-sized, staffed ships and other sea platform cannot perform safely in all Navy missions in near-shore, or littoral waters. These missions include mine location and avoidance as well as remote surveillance.

268. In 1988, a joint DARPA/Navy Unmanned Undersea Vehicle (UUV) Program was initiated, with the goal of demonstrating that UUVs could meet specific Navy mission requirements.

269. Read more about UUV

270. 1987

271. Tank Breaker/Javelin

272. Beginning in the 1970s, DARPA began the Tank Breaker program in response to deficiencies identified by the U.S. Army and U.S. Marine Corps in their existing infantry anti-tank weapon.

273. The Army evaluated two Tank Breaker designs by industry participants against alternatives in a shoot-off conducted in 1987-1988. The results led to selection of the Texas Instruments (later Raytheon) solution to the tank warfare challenge.

274. Read more

275. MIMIC

276. The Microwave and Millimeter Wave Integrated Circuit (MIMIC) program’s objective was, according to a review by one of its program managers, "to develop microwave/millimeter-wave subsystems for use in military weapon system "front ends" that are affordable, available, and broadly applicable.”

277. The program catalyzed multi-faceted research in materials (gallium arsenide), device design, integration, defect management, manufacturing, and other areas. The work yielded a new infrastructure for MIMIC technology with specific applications proliferating throughout the military and commercial sectors.

278. Read more about MIMIC

279. SEMATECH

280. Beginning in 1987, the SEMATECH consortium received funding from the Federal Government to help revitalize the U.S. chipmaking industry.

281. SEMATECH is an acronym that derives from Semiconductor Manufacturing Technology A decade after its founding, in 1997, the consortium was standing on its own without annual funding from the Government.

282. It has since spawned other organizations, such as the International Semiconductor Manufacturing Initiative with a focus on manufacturing equipment and operations.

283. 1985

284. GLOMR satellite

285. The goal of the Global Low Orbiting Message Relay (GLOMR) satellite (aka CHEAPSAT) program was to demonstrate the feasibility of building a two-way, digital data communication satellite capable of performing important military missions for less than a million dollars in under a year. The broader objective was to demonstrate low-cost satellite construction technology that could pave the way for future satellites performing diverse missions.

286. Under DARPA sponsorship, Defense Systems, Inc. (DSI) designed and developed GLOMR. The spacecraft was placed into orbit from a getaway special canister (or GASCAN) aboard the Space Shuttle Challenger (Mission 61-A, Spacelab D-1) in October 1985, and operated successfully on orbit for over 14 months, before it fell back into the Earth’s atmosphere.

287. Read more about GLOMR

288. 1984

289. X-29

290. The December 1984, test flight of the X-29—the most aerodynamically unstable aircraft ever built—demonstrated forward-swept wing technology for supersonic fighter aircraft for the first time. Technology breakthroughs, among them a digital fly-by-wire flight-control system and carbon-fiber wing technology, made possible a lightweight design far more maneuverable than conventional aircraft.

291. Read more about the X-29

292. Sea Shadow

293. Drawing inspiration from his work on the F-117 stealth aircraft, Ben Rich, then head of Lockheed’s Skunk Works, proposed applying the technology concepts he and his colleagues had learned for aircraft to submarines, with the idea of making these vessels undetectable via sonar.

294. The Department of Defense did not show interest in this line of investigation until Rich, with input from a colleague, adapted the idea to apply to surface ships.

295. The Sea Shadow’s first trials in 1981 proved greatly disappointing because the ship’s wake was unexpectedly huge and detectable with sonar and from the air. The vessel was completed in 1984 and underwent night trials in 1985 and 1986.

296. Read more about the Sea Shadow

297. 1983

298. Miniaturized GPS receivers

299. In 1983, in response to a Marine Corps Required Operational Capability to lighten warfighters’ loads, DARPA re-emerged in the GPS-development landscape, focusing on miniaturizing GPS receivers. That effort created a context in which an industry participant in the development process, Rockwell Collins, took the baton to produce a gallium arsenide hybrid chip that allowed for combined analog and digital functionality and the first “all-digital” GPS receivers.

300. Read more about miniaturized GPS receivers

301. 1982

302. Tacit Blue

303. DARPA embarked on the pathbreaking research and development that would lead to stealth technology in the 1970s.

304. In 1976, Northrup received a sole-source grant by DARPA to develop the BSAX aircraft, later named TACIT Blue aircraft, which could operate radar sensors while maintaining its own low radar cross-section. The experimental aircraft first flew in 1982 and the many stealth, radar, and aerodynamic innovations it incorporated laid foundations for development of the B-2 stealth bomber, which was first used in combat in 1999.

305. Read more about Tacit Blue

306. 1981

307. No-Tail-Rotor helicopter

308. In the early 1980s, DARPA nurtured the development of No-Tail-Rotor (NOTAR) technologies, resulting in significantly quieter helicopters that could operate with a lower chance of detection.

309. DARPAs support helped to show the operational advantages of the NOTAR flying demonstrator led to a NOTAR series of helicopters used by government agencies and the commercial sector.

310. The NOTAR system was considered to be the first successful fundamental configuration change to the single-rotor helicopter since the incorporation of the turbine engine in the late 1950s and early 1960s.

311. MOSIS semiconductor service

312. To hasten development in the microelectronics arena of very large-scale integration (VLSI), DARPA funded Metal Oxide Silicon Implementation Service, or MOSIS.

313. The service provided a fast-turnaround (four to 10 weeks), low-cost ability to run limited batches of custom and semicustom microelectronic devices. By decoupling researchers from the need to have direct access to fabrication facilities and to negotiate the complexities of producing microelectronic chips, MOSIS opened innovation in this space to players who otherwise might have been precluded.

314. A key aspect of MOSIS was the pooling of several chip designs onto a single semiconductor wafer. MOSIS opened for business in January 1981 and a MOSIS service was still available in nearly 40 years later.

315. JSTARS

316. In the mid-1970s, DARPA and the U.S. Air Force jointly developed an airborne target-acquisition and weapon-delivery radar program, Pave Mover, under the Agency’s Assault Breaker program. The Pave Mover system relied on even earlier DARPA-sponsored research into moving target indication (MTI) radar for detecting slowly moving targets.

317. As the program progressed, researchers added a synthetic aperture radar (SAR) to analyze areas for which the MTI radar could not detect a moving target, as well as capabilities for detecting helicopters and even rotating antennas. Also originally a part of Pave Mover was a weapon guidance feature.

318. These and other technologies became the basis for the Joint Surveillance and Target Attack Radar System (JSTARS) in the 1980s.

319. Read more about JSTARS

320. 1980

321. Aluminum-lithium alloys

322. In the late 1970s, DARPA initiated a program with Lockheed Space Systems Division to develop the technology of welding aluminum-lithium alloys, which would combine high stiffness with low density and therefore lower weight.

323. Within 18 months, metallurgists at Lockheed had developed the welding techniques for the 80/90 Al/Li alloy and applied it to the construction of space hardware.

324. Read more about aluminum-lithium alloys

325. MIRACL

326. In the mid-1970s, high-energy lasers showed great promise for anti-air warfare and in particular anti-ballistic missile defense. DARPA supported many technology and early system concepts for tactical high-energy lasers. This support culminated in DARPA funding the development of the Baseline Demonstration Laser (BDL) and the Navy ARPA Chemical Laser (NACL), the latter with a joint funding arrangement with the Navy.

327. Concurrent with these systems programs, DARPA funded the Special Laser Technology Development Program, which led to many advanced components and concepts.

328. Read more about MIRACL

329. Defense Sciences Office founded

330. DARPA established the Defense Sciences Office (DSO) in 1980, combining the Nuclear Monitoring Research Office, materials science research, and cybernetic technology efforts into a single office.

331. Since its inception, DSO has spawned two additional technology offices at DARPA: the Microsystems Technology Office (MTO) in 1992 and the Biological Technologies Office (BTO) in 2014.

332. 1978

333. Hubble Telescope assist

334. The National Aeronautics and Space Administrations (NASA) Hubble Telescope takes the clearest images of the universe and transmits these to Earth via its antennas.

335. From 1978 to 1980, DARPA funded the design, fabrication, delivery and installation of two antenna booms for the Hubble Space Telescope to demonstrate the advantages of metal-matrix composites.

336. Read more about Hubble

337. Assault Breaker

338. In 1978, DARPA integrated a number of technologies - including lasers, electro-optical sensors, microelectronics, data processors, and radars - important for precision guided munitions (PGMs) under its Assault Breaker program.

339. Over a four-year period, Assault Breaker laid the technological foundation for several smart-weapon systems that were ultimately fielded with high success.

340. Read the different systems

341. Excimer lasers

342. Building on earlier joint efforts, the U.S. Navy and DARPA initiated a new joint program in 1978 with the objective of achieving a laser communications link between aircraft, space platforms or mirrors, and submerged submarines

343. The ground-based laser-space mirror part of this effort built largely on DARPA efforts toward high-powered, gas-phase excimer lasers (that could emit in the shorter, more water-penetrating region of the electromagnetic spectrum) that had led to the demonstration of a workable, moderate power, laser-optical receiver combination.

344. Excimer lasers would expand into medical arenas, especially for corrective eye surgery.

345. Read how these lasers developed

346. 1977

347. Have Blue and stealth technology

348. In the mid-1970s, DARPA oversaw the development of Have Blue, the first practical combat stealth aircraft, which made its first test flight by the end of 1977. This led to the procurement by the Air Force of the F-117A stealth fighter, which became operational in October 1983.

349. A follow-on development, the Tacit Blue aircraft, could operate radar sensors while maintaining its own low radar cross-section. This laid foundations for development of the B-2 stealth bomber.

350. Learn more about stealth aviation technology

351. 1975

352. Ceramic turbine

353. ARPA began a program to demonstrate and encourage the use of brittle high-temperature materials in engineering design, with an eye on ceramic components for gas turbine applications. In 1979, the program demonstrated design with brittle materials in highly stressed applications is possible and, in particular, that ceramics are feasible as major structural components in gas turbine engines.

354. The successful demonstration of ceramics in a gas turbine environment led to the establishment of ceramic programs in virtually every automotive or engine company in the world.

355. Read how ceramics changed engine design

356. 1973

357. TCP/IP

358. In a seminal moment in the development of the Internet, DARPA’s Robert Kahn (who joined the Information Processing Techniques Office as a program manager in 1972) asked Vinton Cerf of Stanford University to collaborate on a project to develop new communications protocols for sending packets of data across the ARPANET.

359. That query resulted in the creation of the Transmission Control Protocol (TCP) and the Internet Protocol (IP), most often seen together as TCP/IP.

360. These protocols remain a mainstay of the Internet’s underlying technical foundation.

361. 1972

362. Gallium arsenide

363. Gallium arsenide chips were developed through DARPAs Monolithic Microwave Integrated Circuit program, which also enabled the radio frequency (RF) and millimeter-wave circuits needed in precision weapons. These chips contributed to subsequent DARPA-spurred achievement in the 1980s to miniaturize receivers for GPS.

364. Beginning in the mid-1970s, DARPA orchestrated extensive research into the semiconductor material gallium arsenide, which could host faster transistors operating at higher power than could silicon.

365. Learn about GPS development

366. Advanced Aircraft Materials

367. F-15 and F-16 fighter aircraft owe much of their performance advancements to materials technologies that emerged from DARPA materials development programs conducted in the 1970s and early 1980s.

368. One of many notable successes from these efforts was the development of rare-earth permanent magnets with magnetic strengths far stronger than conventional magnetic materials and, in some cases, over larger operational conditions.

369. More about these materials

370. ARPA becomes DARPA

371. The Advanced Research Projects Agency (ARPA) gained a “D” when it was renamed the Defense Advanced Research Projects Agency (DARPA) in 1972.

372. The Agency’s name briefly reverted to ARPA in 1993, only to have the “D” restored in 1996.

373. 1971

374. Glassy Carbon

375. From 1971 - 1974, ARPA supported research on "glassy" carbon, a unique foam material composed of pure carbon and that combined low weight, high strength, and chemical inertness. The program led to techniques for producing the material with an exceptionally porous, high surface area combined with high rigidity, low resistance to fluid flow, and resistance to very high temperatures in a non-oxidizing environment.

376. Eyed originally for roles in electro-chemistry because of its high surface area, the material proved suitable for surgical implants, especially heart valves.

377. More about Glassy carbon evolution

378. Anti-submarine Warfare

379. The Department of Defense (DoD) assigned DARPA a singular mission: Revamp the U.S. military’s anti-submarine warfare (ASW) capabilities to track enemy subs under the open ocean where the U.S. Navy’s existing Sound Surveillance System (SOSUS) was falling short. DARPA-funded scientists began experiments at submarine depths, and soon generated spectacular results.

380. The Surveillance Towed Array Sensor System (SURTASS) array would become the Navy’s go-to method for tracking mobile Soviet subs for the remainder of the Cold War.

381. Learn more about anti-submarine-strategy

382. 1970

383. Camp Sentinel Radar

384. Camp Sentinel responded to a military need for intruder detection with enough accuracy to direct fire. DARPA recommended a foliage penetration radar, which was completed within two years at a direct cost of $2 million. Camp Sentinel radar prototypes were field-tested in Vietnam in 1968 and retained by the troops for use for the rest of the war.

385. The Camp Sentinel technology pioneered the development of radar in hostile jungle conditions, which feature absorption and refraction by foliage in high-clutter environments, among other challenges.

386. See how radar evolved

387. Beryllium Mirror research

388. From 1968 - 1972, ARPA funded a program with the Perkin Elmer Corporation to develop the technology for fabricating large, stable, low-weight mirrors from beryllium, a featherweight metal, for use in space applications. The early focus of the program was in developing and evaluating improved forms of beryllium.

389. Perkin Elmer was successful in improving the thermal stability of beryllium surfaces tenfold, and developing materials-processing techniques (powder metallurgy, hot isostatic processing, pressureless sintering) for making it possible to fabricate large beryllium structures.

390. Learn more about this research

391. 1969

392. Torpedo propulsion

393. In 1969, the Applied Research Laboratory at Penn State began work, under U.S. Navy sponsorship, on a lithium-based thermal energy system for torpedo application. Known as the Stored Chemical Energy Propulsion System (SCEPS), the system was applicable to the high-power, short-duration mission of a torpedo.

394. In a subsequent effort to further torpedo capabilities, DARPA subsequently selected the SCEPS heat source for use with an engine design that could be suitable for deployment in a long-endurance undersea vehicle.

395. Learn about torpedo propulsion development

396. Compact turbofan engines

397. Building on the momentum of jet engine research prior to ARPA’s creation, the Agency joined with the U.S. Army in 1965 on the Individual Mobility System (IMS) project (1965-1969) with the goal of extending the range and endurance of the Bell Rocket Belt developed for the Army in the 1950s. With DARPA funding, Bell replaced the vertical lift rocket system with a compact, highly efficient turbofan engine that Williams Research Corporation was developing.

398. The DARPA project helped bring the WR-19 turbofan engine into full development.

399. Learn more about engine development

400. ARPANET

401. ARPA research played a central role in launching the “Information Revolution,” including developing or furthering much of the conceptual basis for ARPANET, a pioneering network for sharing digital resources among geographically separated computers.

402. Its initial demonstration in 1969 led to the Internet, whose world-changing consequences unfold on a daily basis today.

403. A seminal step in this sequence took place in 1968 when ARPA contracted BBN Technologies to build the first routers, which one year later enabled ARPANET to become operational. | Read more about ARPANET

404. 1968

405. Explosive Forming

406. Between 1968 - 1972, ARPA supported an effort proposed by the University of Denver to use explosives for forming metal parts for aerospace applications. The underwater process relied on a mold for the part over which was placed a plate of the metal alloy to be used.

407. The effort opened a new way to produce a variety made of aerospace components, including engine parts such as engine diffusers and afterburner rings for Pratt & Whitney engines that powered the storied SR71.

408. Read more about the process

409. Mother of All Demos

410. In what became known as "The Mother of All Demos," because it demonstrated the revolutionary features of NLS as well as never-before-seen video presentation technologies, Douglas Engelbart unveiled NLS in San Francisco in December 1968, to a large audience at the Fall Joint Computer Conference.

411. Engelbart's terminal was linked to a large-format video projection system loaned by the NASA Ames Research Center and via telephone lines to a SDS 940 computer (designed specifically for time-sharing among multiple users) 30 miles away in Menlo Park, California, at the Augmentation Research Center, which Engelbart founded at SRI.

412. Learn more about this demo

413. 1967

414. QT-2 Quiet Aircraft

415. The efficacy of nighttime aerial reconnaissance operations in Southeast Asia was diminished due to engine noise that provided the enemy with advanced warning of approaching aircraft.

416. With an eye on making quiet aircraft that could better serve this reconnaissance mission, ARPA funded the Lockheed Missile and Space Company to develop a quiet, propeller-driven aircraft. This fast-paced program quickly yielded a successful prototype, the QT-2, which in 1968 was deployed and proven in combat. | Learn more about the QT-2

417. 1966

418. M16 Rifle

419. The M16 Assault Rifle is the standard-issue shoulder weapon in the U.S. military. Designed to fire small, high-velocity rounds (5.56 mm caliber vs. 7.62 mm), the weapon is relatively small and light, thereby significantly decreasing the overall load warfighters needed to carry.

420. Through Project AGILE, DARPA purchased 1,000 AR-15s and issued them to combat troops in Southeast Asia for field trials, to prove that the high-velocity 5.56 mm round had satisfactory performance. The subsequent DARPA report documenting the lethality of the AR-15 was instrumental in motivating the Secretary of Defense to reconsider the Army’s decision and this led to a the first large-scale procurement in 1966 of a modified AR-15 — the M16 — for deployment in the Vietnam conflict.

421. More about the M16

422. Shakey the Robot

423. Charles Rosen, head of the Machine Learning Group at the Stanford Research Institute (now known as SRI International) developed a proposal in 1964 to build a robot that at the time would have featured the intelligence and capabilities that had only been depicted in science fiction books and movies. Six years later, Rosen’s team literally rolled out Shakey, so-named because it shook as it moved.

424. Shakey was the first mobile robot with enough artificial intelligence to navigate on its own through a set of rooms. Among its component technologies were a TV camera, a range finder, radio communications, and a set of drive wheels controlled with stepping motors.| Learn more about Shakey

425. 1964

426. Project MAC

427. One of the first major efforts supported by ARPA's Information Processing Techniques Office (IPTO) was the Project on Mathematics and Computation (Project MAC), the world’s first large-scale experiment in personal computing, at the Massachusetts Institute of Technology (MIT).

428. A major thrust of Project MAC was to develop general purpose time-sharing capabilities, which later influenced the design of computer systems for commercial and defense uses. Within years of its start, Project MAC would evolve into the world’s first online community, complete with online bulletin boards, email, virtual friendships, an open-source software exchange—and hackers. | Learn more about Project MAC

429. First computer mouse

430. As part of an ARPA-funded experiment to find better ways for computer users to interact with computers, Douglas Engelbart of SRI — who would later work on the DARPA-sponsored ARPANET project, the Internet’s precursor — invented the computer mouse.

431. The first mouse was carved out of wood and had just one button. Later incarnations such as this early Logitech® mouse led to the diversity of mice now on desktops around the world. | Learn more about the first computer mouse

432. 1963

433. Vela: Nuclear explosion detection

434. The ARPA Vela program developed sensors to detect nuclear explosions in space, the upper atmosphere, and underwater to support the 1963 Limited Nuclear Test Ban Treaty, under which the United States, Great Britain, and the Soviet Union banned atmospheric tests of nuclear weapons.

435. Arecibo Observatory

436. In 1959, Cornell University signed a contract with ARPA to conduct development studies for a large-scale ionospheric radar probe and how such an instrument might also serve in radioastronomy and other scientific fields.

437. Its telescope "dish"—the largest in the world until 2016 with the completion in China of the FAST dish telescope—is 1,000 feet (305 meters) in diameter, 167 feet (51 meters) deep, and covers an area of approximately 20 acres (0.08 square kilometers). | Learn more about the observatory

438. 1962

439. oN-Line System

440. A groundbreaking computer framework known as oN-Line System (NLS) got off the ground thanks to funding from DARPA and the U.S. Air Force.

441. Conceived by Douglas Engelbart and developed by him and colleagues at the Stanford Research Institute (SRI), the NLS system was the first to feature hypertext links, a mouse, raster-scan video monitors, information organized by relevance, screen windowing, | Learn more about this system

442. Information Processing Techniques Office

443. DARPA’s Information Processing Techniques Office (IPTO) was born in 1962 and for nearly 50 years was responsible for DARPA’s information technology programs. IPTO invested in breakthrough technologies and seminal research projects that led to pathbreaking developments in computer hardware and software.

444. Some of the most fundamental advances came in the areas of time-sharing, computer graphics, networking, advanced microprocessor design, parallel processing and artificial intelligence.| See how IPTO became the Information Innovation Office (I2O)

445. 1961

446. ARPA midcourse optical station

447. The Agency initiated the ARPA Midcourse Optical Station (AMOS) program in 1961 with the goal of developing an astronomical-quality observatory to obtain precise measurements and images of satellites, payloads, and other space objects re-entering the atmosphere from space.

448. ARPA located the facility atop Mount Haleakala, Maui, Hawaii, nearly 10,000 feet above sea level.

449. By 1969, the quality and potential of AMOS had been demonstrated, and a second phase began to measure properties of re-entry bodies at the facility under the Advanced Ballistic Reentry System Project. | Learn more about this optical station

450. Project Agile

451. In what ended up being for the Agency an extremely rare practice of direct or near-direct support of active military operations, ARPA initiated Project Agile in 1961, which grew into a large and diverse portfolio of counterinsurgency research programs in Southeast Asia.

452. Along the way, subprojects included weapons (among them flamethrowers and what became known as the M-16 assault rifle), rations, mobility and logistics in remote areas, communications, surveillance and target acquisition, defoliation, and psychological warfare.

453. 1960

454. Corona reconnaissance satellite

455. One of the world’s earliest and most well-known spy satellite programs, the now declassified Corona photo-reconnaissance program was jointly funded by DARPA and the Central Intelligence Agency.

456. Withstanding a series of initial failures, the program scored its first success in August 1960 when a canister of film dropped back through the atmosphere was successfully recovered, delivering a trove of intelligence photos taken over Soviet territory. | Learn more about this satellite

457. Materials Science

458. In 1960, ARPA helped establish what now is the burgeoning field of materials science and engineering by announcing the first three contracts of the Agency’s Interdisciplinary Laboratory (IDL) program.

459. The program lasted just over a decade when, in 1972, the National Science Foundation (NSF) took over the program and changed its name to the Materials Research Laboratories (MRL) program.| Learn more about this program

460. Transit satellite: Space-based navigation

461. ARPA launched the first satellite in what would become the world's first global satellite navigation system. Known as Transit, the system provided accurate, all-weather navigation to both military and commercial vessels, including most importantly the U.S. Navy's ballistic missile submarine force.

462. ARPA funded the Transit program in 1958, launched its first satellite in 1960, and transitioned the technology to the Navy in the mid-1960s. By 1968, a fully operational constellation of 36 satellites was in place.

463. 1959

464. First weather satellite (TIROS)

465. Initiated by ARPA in 1958 and transferred to NASA in 1959, the Television and Infrared Observations Satellites (TIROS) program became the prototype for the current global systems used for weather reporting, forecasting and research by the Defense Department, NASA and the National Oceanographic and Atmospheric Administration (NOAA).

466. Moreover, TIROS helped define ARPAs model of successfully bringing together scientists and engineers from different services, federal agencies, and contracting firms to solve vexing problems and quickly achieve a complex technical feat. | Learn more about TIROS

467. Phased array radar

468. Known as the Electronically Steered Array Radar (ESAR) program, the focus of the effort was to develop low-cost, high-power tubes and phase shifters, extend component frequency ranges, increase bandwidth, apply digital techniques, and study antenna coupling. DARPA pioneered the construction of ground-based phased array radars such as the FPS-85.

469. This radar system had a range of several thousand miles and could detect, track, identify, and catalog Earth-orbiting objects and ballistic missiles. The FPS-85 quickly became part of the Air Force SPACETRACK system and was in operation from 1962 until the SPACETRACK unit was deactivated in early 1967. | Learn more about phased array radar

470. 1958

471. ARPA is born

472. On Feb. 7, 1958, Neil McElroy, the Department of Defense Secretary, issued DoD Directive 5105.15 establishing the Advanced Research Projects Agency (ARPA), later renamed the Defense Advanced Research Projects Agency (DARPA).

473. The Agency’s first three primary research thrusts focused on space technology, ballistic missile defense, and solid propellants

474. Saturn V and Centaur rockets

475. In its first months, ARPA managed and funded rocket development programs that would prove to be long-lived and far-reaching. Among these was a launch-vehicle program under the auspices of Wernher von Braun’s engineering team that would transfer to America’s new civilian space program, the National Aeronautics and Space Administration (NASA).

476. There, von Braun’s initial booster technology, Juno V, would lead to the cluster-engine Saturn V Space Launch Vehicle, famous for its role in manned spaceflight to the Moon. Another DARPA-authorized program in 1958, development of a liquid oxygen/hydrogen (LOX/LH2) upper-stage rocket known as Centaur, also transferred to the fledgling NASA. | Learn more about the Saturn V

477. 1957

478. The Sputnik surprise

479. On Oct. 4, 1957, the Soviet Union (USSR) launched the first satellite ever, triggering events that led to creation of the Advanced Research Projects Agency (ARPA) in February 1958.

480. Although it was well known that both the USSR and the United States were working on satellites for the international scientific collaboration known as the International Geophysical Year (an 18-month year from July 1, 1957 to Dec. 31, 1958 and designed to coincide with a peak phase of the solar cycle), many in the United States never fathomed that the USSR would be the first into space. | Learn more about Sputnik