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In the Orbiter Processing Facility, STS-110 Mission Specialists Rex Walheim (left) and Steven Smith (right) look over the payload bay of Atlantis during Crew Equipment Integration Test activities, which include familiarization with the vehicle and payload. . The mission, 13th assembly flight to the International Space Station, includes the Integrated Truss Structure S0. The ITS S0 is the center segment on the Space Station, part of the 300-foot (91-meter) truss attached to the U.S. Lab. By assembly completion, four more truss segments will attach to either side of the S0 truss. STS-110 is scheduled to launch April 4, 2002