Illustration of the US crew for the Apollo Soyuz Test Project (ASTP) riding their spacecraft. From left to right are Vance D. Brand, command module pilot; Donald K. Slayton, docking module pilot; and Thomas P. Stafford, commander. The ASTP mission was the first joint international crewed space-flight. It took place from 15-24th July 1975. A Soviet Soyuz 19 and American Apollo CSM-111 spacecraft docked in orbit on 17th July to test a jointly-designed international docking mechanism. Illustration by cosmonaut Aleksey A. Leonov, commander of the Soviet ASTP crew.