Liberty Star one of NASA's rocket booster retrieval ships is pictured at NASA's Kennedy Space Center.

Liberty Star, one of NASA's solid rocket booster retrieval ships, is pictured in the Turn Basin at NASA's Kennedy Space Center in Florida. In the background is the Vehicle Assembly Building where External Tank ET-122 was just delivered from NASA's Michoud Assembly Facility in New Orleans for Endeavour's STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. Photo credit: NASA/Kim Shiflett