List of United States Marine Corps astronauts

Glenn was the only Marine to fly in the Mercury program, and also flew aboard the Space Shuttle Discovery in 1998.

USAF astronaut Gordon Cooper was a former Marine, having previously served as an enlisted Infantryman before receiving his Air Force commission.

It set major milestones in human spaceflight and stands alone in sending crewed missions beyond low Earth orbit.

U.S. Marines who were astronauts in the Apollo program are: NASA's Space Shuttle, officially called the Space Transportation System (STS), was the United States government's crewed launch vehicle until its retirement in 2011.

When its mission is complete, the shuttle could independently move itself out of orbit and re-enter the Earth's atmosphere.