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The space shuttle Endeavour is seen on Launch Pad 39A after the rollback of the Rotating Service Structure (RSS), Thursday, April 28, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Launch was planned for April 29, but was delayed due to technical problems. Endeavour and the STS-134 crew launched on May 16, 2011 to 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.