On Sat, Jul 19, 2025 at 11:34 AM Adam Sampson <ats@offog.org> wrote:

The FLAG DAY entry was added between 1977-02-01 and 1977-03-11

This matches my memory. BTW: 1975 it was in day-to-day lingo in the ARPANET community, such as I was in at CMU, so I suspect it was from much earlier, such as the Multics reference. At some point - which looks like early 1977, someone added it to the Jargon file, but it was hardly a new term by then.