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An interior view of the Docking Module trainer, in Building 35, during Apollo-Soyuz Test Project (ASTP) joint crew training at NASA's Johnson Space Center (JSC). Astronaut Thomas P. Stafford, commander of the American ASTP prime crew, is on the right. The other crewman is cosmonaut Aleksky A. Leonov, commander of the Soviet ASTP prime crew. The training session simulated activities on the second day in Earth orbit. The American and Soviet crews will visit each other's spacecraft during the July 1975 docking mission in Earth orbit. The Docking Module is designed to link the Apollo and Soyuz spacecraft.