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ISS Unity Unity was the first U.S.-built component of the International Space Station. It consisted of a six-sided connecting module and passageway, and was the primary cargo of Space Shuttle mission STS-88, the first mission dedicated to assembly of the station. Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2008 except where otherwise noted.