Figure 1-24. Progress logistics resupply spacecraft. It consists of the dry cargo module (left); the tanker compartment (center); and a stretched service module (right).

Progress (figure 1-24) was an unmanned version of the Soyuz Ferry designed to perform logistics resupply of the Salyut 6, Salyut 7, and Mir space stations. Progress missions 1 through 12 carried supplies to Salyut 6. Missions 13 through 24 visited Salyut 7, as did the unusual Progress-related Cosmos 1669 mission. Progress missions 25 through 42 served the Mir station. The first 17 Progress missions to Mir delivered 40 tons of supplies, about double the station’s launch weight. Most Progress spacecraft functioned routinely, as expected of a logistics spacecraft. No docking anomalies occurred in the 43 flights of Progress (Progress 1 through 42 plus Cosmos 1669).
Mir Hardware Heritage. NASA Reference Publication 1357 (March 1995).
David S. F. Portree / NASA