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Six Apollo-Soyuz Test Project crewmen participate in joint crew training in Building 35 at the Johnson Space Center. They are (wearing flight suits), left to right, astronaut Thomas P. Stafford, commander of the American ASTP prime crew; astronaut Donald K. Slayton, docking module pilot on Stafford's crew; cosmonaut Valeriy N. Kubasov, engineer on the Soviet ASTP first (prime) crew; astronaut Vance D. Brand, command module pilot on Stafford's crew; cosmonaut Aleksey A. Leonov, commander of the Soviet ASTP first (prime) crew; and cosmonaut Vladimir A. Dzhanibekov, commander of the Soviet ASTP third (backup) crew. Brand is seated next to the hatch of the Apollo Command Module trainer. This picture was taken during a "walk-through" of the first day's activities in Earth orbit. The other men are interpreters and training personnel.