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The hands of cosmonaut Valerly N. Kubasov are seen as the ASTP engineer adds his name to the signature on the Soviet side of the official joint certificate marking an historical moment during the rendezvous day of the Apollo-Soyuz Test Project. The left hand of astronaut Donald K. Slayton, NASA's docking module pilot, is seen at left. The certificate had earlier been signed by astronauts Thomas P. Stafford, American crew commander; Slayton and cosmonaut Aleksey A. Leonov, Soviet crew commander, and it awaits the signature of astronaut Vance D. Brand, NASA's command module pilot who remained in the CM while the others signed in the Soviet Orbital Module of the Soyuz.