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Prime crew commanders for the joint U.S.-USSR Apollo-Soyuz Test Project (ASTP) take a break from busy simulations at NASA's Johnson Space Center (JSC) to enjoy a lighter moment. Cosmonaut Aleksey A. Leonov sticks his head through the Soyuz orbital module mock-up in the Flight Crew Training Facility (Building 35) at JSC, while his American counterpart, astronaut Thomas P. Stafford, looks on. The two men were pausing from a simulation of joint crew second-day ASTP activities.