I find it interesting that for the first 3-4 decades after Roswell, when UFO sightings became more and more frequent (and generally accepted by the masses as a real but unexplained phenomenon), the Airforce and Military intelligence worked hard to discredit all sightings as nothing, and created a program for studying them that's real function was to collect the sightings and discredit/dismiss them as nothing. They were largely successful, turning the UFO phenomenon into a topic to be mocked by the masses rather than be curious about.

Then, seemingly suddenly, since about Reagan, UFOs become a psyop to bring about world unification under a NWO/ One World Government, with increasing disclosure drip fed about the reality of , now renamed UAPs and taken relatively seriously. You had numerous popular UFO/alien movies in the 80's made seemingly realistically with a serious tone (Flight of the Navigator, E.T., Close Encounters) rather than the ludicrous and fantastical type of movies that came before.

It's an almost total reversal, though done gradually over time.