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KENNEDY SPACE CENTER, FLA. -- At KSC's Shuttle Landing Facility, workers watch as a S0 (S Zero) truss segment built for the International Space Station (ISS) is moved out of the "Super Guppy" aircraft that brought it to KSC from Boeing in Huntington Beach, Calif. At right a cameraman records the exercise. The truss segment, which will become the backbone of the orbiting ISS, is a 44by 15-foot structure weighing 30,800 pounds when fully outfitted and ready for launch. It will be at the center of the ISS 10-truss, girderlike structure that will ultimately extend the length of a football field. Eventually the S0 truss will be attached to the U.S. Lab, "Destiny," which is scheduled to be added to the ISS in April 2000. Later, other trusses will be attached to the S0 on-orbit. During processing at KSC, the Canadian Mobile Transporter will be installed on the S0 truss, followed by power distribution system modules, a heat pipe radiator for cooling, computers, and a pair of rate gyroscopes. Four Global Positioning System antennas are already installed. The S0 truss is scheduled to be launched in the first quarter of 2001 on mission STS-108