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KENNEDY SPACE CENTER, FLA. - The first Space Shuttle vehicle destined to fly in space moves toward Pad A at Complex 39, where it will be launched. The STS-1 vehicle - consisting of America's first reusable spaceship, Columbia, the external propellant tank and twin 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, about 3.5 miles away.