The GEMINI program was a NASA program that ran from 1961 to 1966. It was the second human spaceflight program conducted by the United States, following the Mercury program. The program aimed to develop technology needed for the Apollo program, which would eventually lead to the first human landing on the Moon. GEMINI included ten manned missions, two unmanned missions, and various scientific experiments. The program was successful in achieving its goals, and laid the groundwork for the Apollo program.