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KENNEDY SPACE CENTER, FLA. - After landing at the KSC Shuttle Landing Facility, STS-110 Mission Specialist Rex Walheim smiles in anticipation of his first Space Shuttle flight, scheduled for launch April 4. Mission STS-110 is the 13th assembly flight to the International Space Station. During four planned spacewalks, crew members will install the S0 Integrated Truss Structure (ITS), centerpiece of the orbiting International Space Station (ISS), at the center of the 10-truss, girderlike structure that will ultimately extend the length of a football field on the ISS. The S0 truss will be attached to the U.S. Lab, "Destiny," on the 11-day mission