DARPA = Defense Advanced Research Projects Agency. It's a research and development agency of the United States Department of Defense that is responsible for the development of emerging technologies for use by the military.
Originally known as the Advanced Research Projects Agency (ARPA), the agency was created on February 7, 1958, by President Dwight D. Eisenhower in response to the Soviet launching of Sputnik 1 in 1957.
https://en.wikipedia.org/wiki/DARPA
A lot of personal computer and Internet technology was developed (at least in part) at this agency.
When I was in 5th grade in about 1966, my school had a dialup modem connection to a mainframe computer that was located at a university about 50 miles away. It ran at 150 baud, so not very fast.
We could communicate with the university, and we learned some beginning programming in Basic language. I suppose it was pretty advanced stuff for elementary kids at that time.