I've been doing some research of the Gemini and Apollo flight crew assignments, and found this interesting.Both Dave Scott and Charlie Bassett were actually assigned to two flight crews before ever flying in space.Scott was assigned to Gemini 8 and McDivitt's Apollo 3 crew, and at the same time Bassett was assigned to both Gemini 9 and Borman's Apollo 4 crew.Correct me if I'm wrong, but in shuttle history hasn't that happened only with astronauts that have already flown in space (ie: Crippen: 41-C and 41-G)?