Operation Paperclip
The United States and Great Britain forgave their sins so we can stay ahead of the Russians.
We benefited from their services and so did the Soviet Union. Remember there was a Cold War going on.
German rocket scientist accused of using slave labor to build the V-2 rocket that pummeled London. He later won NASA's highest honor for helping to put a man on the moon
Wehrner Von Braun was also director of our ballistic missile program. He developed the IRBM: Redstone rocket which was used in two atomic tests over Johnston Island in 1958. Operation Teak and Orange. He also flight director for NASA at the time of the moon landings. Nobody came out of WWII with clean hands.
http://en.wikipedia.org/wiki/Operation_Paperclip