first came project silver bug, the air force's answer to concentrations of aircraft at runways making easy targets for nukes. vertical takeoff means no runway. but it never really worked. the pye wacket was an air-to-air missile concept. both were supposedly continuations of nazi research picked up in project paper clip.
the air force scrapped this project (if it existed at all) due to stability problems. same deal with the avrocar.
the lenticular reentry vehicle, meant to be an orbiting delivery platform for nukes, also seemed to have its share of trouble, as the only physical evidence of its existence seems to be debris.

Jeez, man the us military has had saucer technology for years. They actually sold it to the nazis in exchange for warp technology which was stupid on the nazis part because the us used it to develop time travel fields and go back, take the saucers back and win the war. That's why the pope is.. Hold, on there's a banging on the door.
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I was somewhat concerned about the blood smearing on our neighbours wall (deservedly so I might add)that my husband did but now reading about this pye wacking stuff I find myself in a conundrum of doubts for his sanity.
Husband, do you want to talk?
Hello, love. No need to worry. Everything's fine. The flying saucer people had nothing to do with the blood. When I keep my tinfoil hat on nice and tight, they can't beam the thoughts into my head and tell me what to do any more.
Mostly.