The only astronaut to fly on Mercury, Gemini, and Apollo space flights is Wally Schirra.

* Mercury: He flew on the Mercury-Atlas 8 mission in 1962.

* Gemini: He commanded Gemini 6A in 1965 and Gemini 7 in 1965.

* Apollo: He commanded Apollo 7 in 1968, the first manned Apollo mission.