Details of Project 1794:
https://www.youtube.com/watch?v=aFoSYntvFVk
Avrocar - Footage of the Air Force's Real Flying Saucer:
https://www.youtube.com/watch?v=iLaFQbatAx8
Photo of the Avrocar:
https://media.defense.gov/2021/Jul/01/2002755255/-1/-1/0/210621-F-AU145-1070.JPG
That I don't know, although I have heard and read rumors that by the 1960s, the head of the Skunk Works at Nellis AFB said things like "We can take ET home." I've always wondered what space program we REALLY have that is not discussed. A British computer hacker, Gary McKennon, hacked into Pentagon computers several years ago and found files on "non-terrestrial officers" and names of "ships" that were not in the inventory of the US Navy fleet. I seem to recall that the ship Ticonderoga was one of them, and that a space program was called "Space Warden" or something like that.
Whatever tech we've managed to develop, most certainly got an assist from the Nazis, at the very least. It wouldn't surprise me to discover that we've also reverse-engineered some downed UFOs, either...or gotten an alien assist.
At this point in the plan, there's not much that I wouldn't consider...
"Alice laughed: "There's no use trying," she said; "one can't believe impossible things."
"I daresay you haven't had much practice," said the Queen. "When I was younger, I always did it for half an hour a day. Why, sometimes I've believed as many as six impossible things before breakfast."
-- Through the Looking Glass.
Oh I think you're probably right on both counts. We are not alone, that's for sure.