KENNEDY SPACE CENTER, FLA. - At Port Canaveral, a tug maneuvers the barge carrying a newly redesigned External Tank (ET-121) toward the dock. The tank is designated for use on Return to Flight mission STS-121. The barge was towed on a 900-mile journey at sea from the Michoud Assembly Facility in New Orleans by NASA’s Solid Rocket Booster Retrieval Ship Freedom Star. At Port Canaveral, the barge will be hooked up to tugs for the last part of the journey to the Launch Complex 39 Area Turn Basin at NASA’s Kennedy Space Center. It will then be offloaded and transported to the Vehicle Assembly Building.