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An interior view of the Docking Module trainer in Building 35 during Apollo-Soyuz Test Project joint crew training at NASA's Johnson Space Center. Astronaut Donald K. Slayton (right) is the docking module pilot of the American ASTP prime crew. The other crewman is cosmonaut Valeriy N. Kubasov, engineer on the Soviet ASTP first (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.