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The aft skirt and lower segment of the Solid Rocket Booster (SRB) being prepared for Return to Flight on mission STS-114 are being transported from the Rotation Processing and Surge Facility to the Vehicle Assembly Building. Other segments will be moved to the VAB later for stacking. 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 operate parallel with the Space Shuttle main engines for the first two minutes of flight and jettison away from the orbiter with help from the Booster Separation Motors, about 26.3 nautical miles above the Earths surface.