"From 1958 to 1965, ARPA’s emphasis centered on major national issues, including space, ballistic missile defense, and nuclear test detection.[21] During 1960, all of its civilian space programs were transferred to the National Aeronautics and Space Administration (NASA) and the military space programs to the individual services.[22]
This allowed ARPA to concentrate its efforts on Project Defender (ballistic missile defense), Project Vela (nuclear test detection), and Project Agile (counterinsurgency R&D programs), and to begin work on computer processing, behavioral sciences, and materials sciences. The DEFENDER and AGILE programs formed the foundation of DARPA sensor, surveillance, and directed energy R&D, particularly in the study of radar, infrared sensing, and x-ray/gamma ray detection."
ARPA was renamed to DARPA in 1972.
"DARPA supported the evolution of the ARPANET (the first wide-area packet switching network), "
There was no Internet in 1972. It was ARPANET which was run by DARPA. The D was added to reaffirm that ARPA was the department of defense, not civilian research.
ARPA was military.
"From 1958 to 1965, ARPA’s emphasis centered on major national issues, including space, ballistic missile defense, and nuclear test detection.[21] During 1960, all of its civilian space programs were transferred to the National Aeronautics and Space Administration (NASA) and the military space programs to the individual services.[22]
This allowed ARPA to concentrate its efforts on Project Defender (ballistic missile defense), Project Vela (nuclear test detection), and Project Agile (counterinsurgency R&D programs), and to begin work on computer processing, behavioral sciences, and materials sciences. The DEFENDER and AGILE programs formed the foundation of DARPA sensor, surveillance, and directed energy R&D, particularly in the study of radar, infrared sensing, and x-ray/gamma ray detection."
ARPA was renamed to DARPA in 1972.
"DARPA supported the evolution of the ARPANET (the first wide-area packet switching network), "
https://en.wikipedia.org/wiki/DARPA
There was no Internet in 1972. It was ARPANET which was run by DARPA. The D was added to reaffirm that ARPA was the department of defense, not civilian research.