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While gathering with friends and family at the pad, the STS-110 crew poses in front of Space Shuttle Atlantis still enclosed by the Rotating Service Structure. Standing left to right are Mission Specialist Steven Smith, Jerry Ross and Lee Morin; Pilot Stephen Frick; Mission Specialist Rex Walheim; Commander Michael Bloomfield; and Mission Specialist Ellen Ochoa. The mission continues the expansion of the International Space Station by delivering and installing the S0 Integrated Truss Structure, the initial section of a framework that will eventually hold the power and cooling systems needed for future international research laboratories. The payload also comprises the Canadian Mobile Transporter (attached to the S0 truss), power distribution system modules, a heat pipe radiator for cooling, computers and a pair of rate gyroscopes. The 11-day mission is the 13th assembly flight to the ISS and includes four spacewalks to attach the S0 truss to the U.S. Lab Destiny. Launch is scheduled for April 4