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Operations, security and other personnel escort the orbiter Discovery from the Orbiter Processing Facility to the Vehicle Assembly Building (VAB). OV-103 will spend about five working days in the VAB, where it will be mated with the external tank/twin solid rocket booster assembly. The fully assembled Space Shuttle will then be rolled out to Launch Pad 39B. Liftoff on Mission STS-64 is targeted for early September.