At NASA's Kennedy Space Center in Florida, Space Shuttle Endeavour after the rotating service structure (RSS) was moved away, 15 May 2011. The structure provides weather protection and access to the shuttle while it awaits lift off on the pad. STS-134 will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Endeavour was scheduled to on 29 April, but that attempt was scrubbed because of an issue associated with the shuttle's Auxiliary Power Unit 1. STS-134 will be the final spaceflight for Endeavour and the launch is now slated for 16 May.