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KENNEDY SPACE CENTER, FLA. -- In the Launch Complex 39 Area turn basin, the lead tugboat moves out of the way of the Pegasus barge so the barge can dock and offload its cargo. The barge carries external tank No. 120, to be used for launching Space Shuttle Discovery on mission STS-120 in October. The barge has carried the tank from the Michoud Assembly Facility near New Orleans, making the journey around the Florida peninsula in tow by the JA Bisso II tugboat, to Port Canaveral and Kennedy Space Center. After the tank is offloaded, it will be towed to the Vehicle Assembly Building for lifting into a checkout cell. NASA/Amanda Diller