Q: Which astronaut was the only one of the Mercury 7 astronauts to fly in all three of NASA's 'Moon Shot' programs (Mercury, Gemini and Apollo)?
A: Wally A. Schirra was the only man to fly in all three projects. Alan Shepard flew in Mercury and Apollo, but not in Gemini. Gus Grissom was involved in all three project, flying in Mercury and Gemini, but he was killed during a pre-flight simulation in his Apollo 1 capsule, so he never actually flew in the Apollo program.