DARPA (Defense Advanced Research Projects Agency) was founded in 1958, originally as ARPA, in response to the Soviet launch of Sputnik. Its mission was to prevent technological surprise. ARPANET, the precursor to the modern internet, was one of its projects. The "D" for "Defense" was added in 1972, removed in 1993, then added back again in 1996.
ARPANET was created during the ARPA era, which is why it's called ARPANET and not DARPANET. The name stuck even after the agency got its D back.
DARPA (Defense Advanced Research Projects Agency) was founded in 1958, originally as ARPA, in response to the Soviet launch of Sputnik. Its mission was to prevent technological surprise. ARPANET, the precursor to the modern internet, was one of its projects. The "D" for "Defense" was added in 1972, removed in 1993, then added back again in 1996.
ARPANET was created during the ARPA era, which is why it's called ARPANET and not DARPANET. The name stuck even after the agency got its D back.