And still I wonder.
Did much of our stealth plane technology design come from reverse engineered alien aircraft, recovered from crashes or shoot downs?
Ancient astronaut theorists say YES!!!
IIRC, a Soviet Physicist wrote a book on the theoretical design for stealth planes. The Soviets allowed it to be open published. Lockheed Martin used the theory to develop the F-117. The reason for it’s choppy look was that computer programs of the day didn’t have the computational power to design a smooth skin. Lockheed actually ended up hiring the Russian physicist.