アポロ・ソユーズテスト計画
The Apollo program included three other crewed missions. Apollo 1 did not launch and its crew died in a ground-based capsule fire, and Apollo 7 and Apollo 9 were low Earth orbit missions testing spacecraft components and docking maneuvers. Nine astronauts later flew unused Apollo command modules in the Apollo Applications Program's Skylab and Apollo–Soyuz Test Project.