For the record....LOL
To what extent are they covering up black programs and to what extent have other countries found holes in our air defenses, which would also be classified into non-existence and given a cover story like ... aliens.
The thing is that this phenomenon has existed and documented since the 1940’s, long before we could even dream of developing the technology. Still think it was human technology back then?
That said, Navy pilots who are dealing with these things daily (in some cases) say they exhibit behavior and performance characteristics which defy our present understanding of physics. This is now also coming from scientists in and out of government.
Prof Garry Nolan of Stanford for example.
“To what extent are they covering up black programs and to what extent have other countries found holes in our air defenses, which would also be classified into non-existence and given a cover story like ... aliens.”
Roswell likely a coverup using aliens. The most top secret program at that time was the Nazi rocket scientists at White Sands. Maybe the wreckage was a crashed V-2 rocket. Imagine the stink if sneaking Nazis into the US would have caused.