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The Apollo Soyuz Test project was the first docking of an American spacecraft to a Soviet one. With the historic docking occurring in July of 1975, the mission was the last flight of the Apollo Command and Service module, and the only flight of Mercury 7 astronaut Deke Slayton, who had been grounded from the Mercury and Gemini programs as a result of a heart murmur. American spacecraft would later dock with Russian spacecraft once more when Commander Hoot Gibson docked Space Shuttle Atlantis to the Russian Mir space station in the mid 1990s as the beginning of the Shuttle-Mir program. The Russian Federal Space Agency (Roscosmos) and NASA would later work together once more not too long afterwards to build the International Space Station, a merger project which originally was two separate space stations called Mir-2 and Freedom as well as the planned European and Japanese modules onboard Freedom, and Canadian hardware such as the Canadarm (no seriously, that's legitimately what it's called).