The Soyuz-T was the third generation of the Soyuz spacecraft and operated from 1979 to 1986. The T designation stood for "transport", reflecting its primary role ferrying crews to and from space stations. The design was based on the second-generation Soyuz 7K-T and incorporated experience gained from the Military Soyuz program and the Soyuz 7K-TM used for the Apollo–Soyuz Test Project.