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KENNEDY SPACE CENTER, FLA. - The first Space Shuttle vehicle destined to fly in space moves toward Launch Complex 39A where it will be launched. The STS-1 vehicle, consisting of America’s first reusable space ship - the orbiter Columbia, an external propellant tank and two solid rocket boosters, was assembled on a Mobile Launcher Platform in the Vehicle Assembly Building. A six-million pound tractor, called the Crawler-Transporter, is used to carry the Space Shuttle from the VAB to the launch pad, some 3.5 miles away.