Apollo program
The Apollo program was a NASA spaceflight endeavor that landed the first humans on the Earth's moon. It set major milestones in human spaceflight and stands alone in sending manned missions beyond low Earth orbit. The Apollo program ran from 1961 until 1975, and was the U.S. civilian space agency's third human spaceflight program (following Project Mercury and Project Gemini). The program used Apollo spacecraft and Saturn launch vehicles, which were later used for the Skylab program and the joint American-Soviet Apollo-Soyuz Test Project. U.S. Marines who were astronauts in the Apollo program are: