On July 15, 1975, the first joint space mission between the United States and the Soviet Union blasted off into orbit. They called it the Apollo-Soyuz Test Project. This mission ceremoniously marked ...

The Apollo-Soyuz Test Project brought Soviet cosmonauts and NASA astronauts together in the first international human spaceflight.

On July 15, 1975, an Apollo spacecraft launched carrying a crew of three and docked two days later on July 17, with a Soyuz spacecraft and its crew of two.