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KENNEDY SPACE CENTER, FLA. -- Tugboats tow the Pegasus barge, with its cargo of external tank No. 125, on the Banana River. Seen in the background are the Atlas V (left) and Titan IV launch complexes. After it is offloaded, the tank will be moved to the Vehicle Assembly Building. The external tank will be used on space shuttle Atlantis for mission STS-122 targeted for launch on Dec. 6. Photo credit: NASA/Troy Cryder