Battles & Wars › Cold War › Sputnik and the space race
DARPA and the ARPANET
ARPA founded 1958; ARPANET's first message 1969· Invention or discovery· Technology, codes & intelligence
Well documentedSolid records, physical evidence or scientific consensus.
The Pentagon's research agency, founded after Sputnik, and the computer network it funded that grew into the internet.
See it on the Battles & Wars map →What happened
President Eisenhower created the Advanced Research Projects Agency (ARPA, later DARPA) in February 1958 so the US would never again be surprised technologically. It funds risky ideas through short contracts with universities and companies. In 1969 its ARPANET sent its first message, from UCLA to Stanford Research Institute; the system crashed after two letters, 'LO'. Its packet switching, which breaks data into small addressed chunks, and its TCP/IP rules (adopted 1983) became the internet. DARPA also funded early stealth and drones.
Why it matters
It showed how defense money could seed civilian revolutions: the internet and the research behind voice assistants such as Siri both trace partly to DARPA contracts.
How we know
ARPA's founding directive, the 1969 UCLA log entry recording the first host-to-host message, and papers and interviews by J.C.R. Licklider, Larry Roberts, Leonard Kleinrock, Vint Cerf and Bob Kahn.
Still debated
Was ARPANET built to survive nuclear war? Mostly a myth: its goal was sharing scarce computers, though Paul Baran's related RAND work did aim at survivability.
Connections (4)
▸First electronic computers (Colossus, ENIAC) were the ancestors of the computers linked by DARPA and the ARPANETWell documented
The connection
Colossus and ENIAC were never networked, but they began the line of ever faster electronic computers. By the 1960s computers were costly and scattered across universities, so the Pentagon's research agency ARPA built the ARPANET in 1969 to let researchers share them, using packet-switching ideas from Paul Baran at RAND and Donald Davies in Britain.
When and how
First message sent October 29, 1969, from UCLA to the Stanford Research Institute; four sites were linked by December 1969.
How we know
ARPA contract records, the original network logs, and participants' accounts, such as Leonard Kleinrock's.
Debates and open questions
A popular story says ARPANET was built to survive nuclear war; its founders say the main aim was sharing computers, though Baran's work had that goal.
▸Sputnik and the space race prompted the founding of DARPA and the ARPANETWell documented
The connection
Sputnik convinced Eisenhower that rivalry among the Army, Navy and Air Force was slowing US research. In February 1958 he created ARPA to fund bold projects directly. Its computing office later paid for the ARPANET, the network that grew into the internet.
When and how
Washington, February 7, 1958, under Defense Secretary Neil McElroy; ARPANET's first link, UCLA to SRI, October 29, 1969.
How we know
ARPA's founding directive and Eisenhower administration records cite Sputnik; DARPA's own histories say the same.
Debates and open questions
The line from Sputnik to the internet runs through many people and decisions; ARPANET's builders were driven by research goals, not Sputnik.
▸DARPA and the ARPANET grew into the internet, the battlefield of Cyber warfare (Stuxnet)Mostly agreed
The connection
ARPANET, funded by the Pentagon's research agency, linked computers so they could share data. It grew into the internet, designed for openness and trust, not security. Once banks, power grids and militaries ran on it, attackers could reach them from anywhere; the 1988 Morris worm was an early warning.
When and how
ARPANET's first message went from UCLA to Stanford Research Institute in 1969; the Morris worm crippled about 6,000 computers in 1988.
How sure are we?
The internet's descent from ARPANET is well documented, and security experts trace many weaknesses to its trusting early design.
Debates and open questions
Whether the internet's builders could realistically have built in security from the start is debated.
▸DARPA and the ARPANET funded the first prototypes of Stealth aircraft (F-117 Nighthawk)Well documented
The connection
In 1974–75 DARPA asked aircraft makers whether a jet could be made nearly invisible to radar. Lockheed's Skunk Works won the resulting contest, and DARPA and the Air Force funded two small Have Blue demonstrators. Their success in 1977–79 led directly to the F-117.
When and how
DARPA, Arlington, Virginia, 1974–76; Lockheed beat Northrop in the 1976 contest; Have Blue flew at Groom Lake from December 1977.
How we know
Declassified program histories and Ben Rich's memoir describe DARPA's role; DARPA lists stealth among its best-known projects.
Debates and open questions
Northrop's losing design fed its Tacit Blue test plane and the later B-2; credit for stealth is shared among firms and agencies.