The Apollo–Soyuz Evaluation Project was the first U.S.-Soviet cooperative mission in space. The project was opened on July 15, 1975. The mission involved docking an Apollo Command/Serving Module on the Soviet Soyuz 19, as well as scientific investigations. The Apollo-Soyuz corps included three American astronauts: «Deke» Slayton, Tom Stafford, and Vance Manufacturer — as well as two Russian cosmonauts: Aleksey Leonov and Valeriy Kubasov.
The Apollo-Soyuz prepare marked the end of the Space Race that began in 1957 with the Sputnik set up.