USA Lt. Kol. P J Corso: Ramstein,Air Force Base in Germany in May 1974.
Antiaircraft missile hits an alien spacecraft. Alien spacecraft managed
to crash land in a valley.
"The day after Roswell", Lt. Kol. J. Corso 1989.
http://www.rjrsnvbrn.com/txt/day-after-roswell-pjcorso.pdf
The USA government knows of the existence of ± 60 species of aliens.
Some of those aliens do have craft that can go as fast as one
lightyear a minute.
There are alien buildings / facilities on the Moon!
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Page ± 53-55:
Everybody wants the best and fastest plane, of course, so that we can
out fly and out shoot the enemy we
know about. But we were also defending our skies against an enemy we
didn't admit to having. The second
agenda was always there and the Cold War provided the budgetary impetus
the military needed : We were
building aircraft to protect against flying saucers. And in a very real
measure, we succeeded.