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KENNEDY SPACE CENTER, FLA. - Inside the Vehicle Assembly Building, NASA ET_SRB Operations Manager Ken Tenbusch provides information for the media about the stacking of the aft skirt and lower segment of the Solid Rocket Booster in the background. These first segments are a significant milestone in the preparations for Return to Flight mission STS-114. Two SRBs support the liftoff of the Space Shuttle on a launch. The twin 149-foot tall, 12-foot diameter SRBs provide the main propulsion system during launch to place the 180,000-pound orbiters in the proper orbit around the Earth. They ope…