Illustration of the Soviet and US crews for the Apollo Soyuz Test Project (ASTP). Clockwise from the ASTP emblem (centre) are, Thomas P. Stafford, US crew commander; Donald K. Slayton, US Docking Module Pilot; Vance D. Brand, US Command Module Pilot; Valeriy N. Kubasov, Soviet Engineer; and Aleksey A. Leonov, Soviet 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 (centre) on 17th July to test a jointly-designed international docking mechanism.