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| An Apollo–Soyuz cover commemorating the docking test between the Soyuz spacecraft and the Apollo Command and Service Module as part of the Apollo–Soyuz Test Project, postmarked at Houston, Texas, with a machine cancel on August 27, 1974.
On August 27, 1974, at NASA Johnson Space Center, Soviet scientists and engineers worked with their U.S. counterparts to conduct docking mechanism compatibility tests. The tests verified the docking adapter, cabin pressure adjustments, and crew transfer procedures between the spacecrafts. |
1974-08-27 USA ASTP Docking Tests
