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Astronaut Donald K. Slayton attaches his life preserver as he egresses an Apollo Command Module trainer in a water tank in Building 260 during water egress training at NASA's Johnson Space Center. The crewmen exit through the hatch when the CM is in this stable I (apex up) position; and they egress through the tunnel when the CM is in a stable II (apex down) position. Astronauts Vance D. Brand (on left) and Thomas P. Stafford have already egressed the trainer and are seated in a three-man life raft. This training session was part of the preparations for the joint U.S.-USSR Apollo-Soyuz Test Project docking mission in Earth orbit scheduled for July 1975. These three men compose the American ASTP prime crew. Stafford is the commander, Brand is the command module pilot, and Slayton is the docking module pilot.