Out of the seven original Mercury astronauts, three of them were selected as candidates for the first manned U.S. spaceflight: John Glenn, Gus Grissom and Shepard.

从7位最初的水星宇航员中，其中三位被选为第一次美国载人航天的候选人：约翰.格伦,加斯.格里森和谢泼德。

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They were Scott Carpenter, Gordon Cooper,John Glenn,Virgil Grissom, Walter Schirra,Alan Shepard and Donald Slayton.

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Shepard partnered with fellow celiac and athlete John Forberger to co-found 1in133.org and host the summit.

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American astronaut Alan Shepard made a suborbital flight later that year, and John Glenn became the first American to orbit Earth in 1962.

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