NASA Astronauts "It's a very sobering feeling to be up in space and realize that one's safety factor was determined by the lowest bidder on a government contract." -Vice Admiral Alan B. Shepard, U.S. Navy Astronaut On this page you will find U.S. Military Personnel and United States Citizens that served as NASA Astronauts. Click a Listing for Details Eileen M. Collins  Colonel O-6,  U.S. Air Force   Leroy Gordon Cooper,  Colonel O-6,  U.S. Air Force   John H. Glenn,  Colonel O-6,  U.S. Marine Corps   Virgil I. Grissom  Lieutenant Colonel O-5,  U.S. Air Force   Wendy B. Lawrence  Captain O-6,  U.S. Navy   Robert M. White  Major General O-8,  U.S. Air Force