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From a vantage point below it, members of the STS-110 crew check out Integrated Truss Structure (ITS) S0, which is in the Operations and Checkout Building. From left are Mission Specialists Rex J. Walheim, Jerry L. Ross and Lee M. Morin. They and other crew members are taking part in a Crew Equipment Interface Test at KSC. Not shown are Commander Michael J. Bloomfield, Pilot Stephen N. Frick, and Mission Specialists Steven L. Smith and Ellen Ochoa. The ITS S0 is part of the payload on the mission. It is the center segment they will be installing on the International 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 currently scheduled to launch in February 2002