[Robert Coats]

I'm a bit of an military history buff, and after the end of The Great War (a.k.a., WWI) the allied were SOOO adamant about the Germans developing powered aircraft, they clamped down on any development of specific aircraft after the war. But, the language was not precise enough to say that gilders and non-piston aircraft were off-limits. So, the Germans took up gilders and rockets, and thus were able the V1 and V2 rockets, as well as advance rocket tech so far advanced both the US and Soviet raced to capture the scientists post-war to gleam the secrets. Google Operation Paperclip for details