Salyut 5

The Soviet Union launches the two-ton Salyut 5 space station into Earth orbit. Salyut 5 is the final Soviet space station to utilize the Almaz military station architecture originally specified in the 1960s (at which time Almaz was developed to counter the perceived threat from the never-launched American Manned Orbiting Laboratory). The station carries Earth surveillance equipment and a return capsule for later retrieval of experiments and film. Salyut 5 remains in orbit for a little over a year, visited by only two crews.