Salyut 3: packin’ heat in orbit

The Soviet Union launches its third space station, again based on the Almaz military space station architecture. Salyut 3 remains in orbit for over half a year, and is eventually visited by the crews of Soyuz 14 and Soyuz 15, though the latter mission fails to dock. Despite international agreements already in place to prevent the militarization of space, Salyut 3 is the first armed space station, packing a non-steerable anti-aircraft gun (for defending the station, though from what is never made clear). Fortunately, the space war never happens and Salyut 3 is never forced to defend itself.