Salyut 3 (OPS-2) (Russian: Салют-3; English: Salute 3) was launched on June 25, 1974. It was another Almaz military space station, this one launched successfully, included in the Salyut program to disguise its true purpose.
It attained an altitude of 219 to 270 km on launch and its final orbital altitude was 268 to 272 km. Salyut 3 had a total mass of about 18 to 19 tons. It had two solar panels laterally mounted on the center of the station and a detachable recovery module for the return of research data and materials. Only one of the three intended crews successfully boarded and manned the station, brought by Soyuz 14.