Water pours out of the 290-foot-high tower that holds 300,000 gallons of water used for sound suppression during shuttle launches on launch pad 39a shortly after the rollback of the Rotating Service Structure (RSS) from the space shuttle Endeavour, Thursday, April 28, 2011, at Kennedy Space Center in Cape Canaveral, Fla. During the 14-day mission, Endeavour and the STS-134 crew will deliver the Alpha Magnetic Spectrometer (AMS) and spare parts including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. Launch is targeted for Friday, April 29 at 3:47 p.m. EDT. Photo credit: (NASA/Bill Ingalls)