CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Endeavour stands majestically on Launch Pad 39A, totally revealed after the rotating service structure (RSS) was rolled away in preparation for the shuttle's upcoming launch. Retraction of the structure, which provides weather protection and access to the shuttle, began at 11:44 a.m. EDT and was completed at 12:24 p.m. RSS "rollback" marks a major milestone in Endeavour's STS-134 mission countdown. Liftoff is scheduled for May 16 at 8:56 a.m. EDT. Endeavour and its crew 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 station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett KSC-2011-3539

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CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, workers monitor the progress of space shuttle Endeavour as it makes its final approach toward the fixed and rotating service structures on Launch Pad 39A. First motion of the 3.4-mile rollaround from Launch Pad 39B was at 3:16 a.m. EDT. Endeavour was on standby on Pad 39B to be used in the unlikely event that a rescue mission was necessary during space shuttle Atlantis' STS-125 mission to NASA's Hubble Space Telescope. The payload on Endeavour's next mission, STS-127, includes the Japan Aerospace Exploration Agency's Kibo Exposed Facility and the Experiment Logistics Module Exposed Section of the International Space Station. They will be installed on the Kibo laboratory already on the station. Launch of STS-127 is targeted for June 13. Photo credit: NASA/Kim Shiflett KSC-2009-3340

KENNEDY SPACE CENTER, FLA. -- Access platforms at Launch Pad 39A are moved into position against Space Shuttle Discovery on a balmy Florida afternoon. Discovery arrived at its seaside launch pad around noon and was hard down at 1:15 p.m. First motion out of the Vehicle Assembly Building was at 6:47 a.m. EDT. Rollout is a milestone for Discovery's launch to the International Space Station on mission STS-120, targeted for Oct. 23. The crew will be delivering and installing the Italian-built U.S. Node 2, named Harmony. The pressurized module will act as an internal connecting port and passageway to additional international science labs and cargo spacecraft. In addition to increasing the living and working space inside the station, it also will serve as a work platform outside for the station's robotic arm. Photo credit: NASA/George Shelton KSC-07pd2635

Discovery Surrounded, NASA Space Shuttle Landing Facility

CAPE CANAVERAL, Fla. – Viewed from the side of Launch Pad 39A at NASA's Kennedy Space Center in Florida, the rotating service structure has been moved into place around space shuttle Endeavour. The RSS provides protected access to the shuttle for changeout and servicing of payloads at the pad. The structure is supported by a rotating bridge that pivots about a vertical axis on the west side of the pad's flame trench. The RSS rotates through 120 degrees (one-third of a circle) on a radius of 160 feet. Support for the outer end of the bridge is provided by two eight-wheel, motor-driven trucks that move along circular twin rails installed flush with the pad surface. The track crosses the flame trench on a permanent bridge. Endeavour is targeted to launch June 13 on its STS-127 mission to the International Space Station. Photo credit: NASA/Tim Jacobs KSC-2009-3357

STS-127 - LAUNCH - Public domain NASA photogrpaph

STS-131 - LAUNCH - Public domain NASA photogrpaph

Kim Shiflett KSC-2011-3539

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CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Endeavour stands majestically on Launch Pad 39A, totally revealed after the rotating service structure (RSS) was rolled away in preparation for the shuttle's upcoming launch. Retraction of the structure, which provides weather protection and access to the shuttle, began at 11:44 a.m. EDT and was completed at 12:24 p.m. RSS "rollback" marks a major milestone in Endeavour's STS-134 mission countdown. Liftoff is scheduled for May 16 at 8:56 a.m. EDT. Endeavour and its crew 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 station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

Space Shuttle Program

The Space Shuttle program was the United States government's manned launch vehicle program from 1981 to 2011, administered by NASA and officially beginning in 1972. The Space Shuttle system—composed of an orbiter launched with two reusable solid rocket boosters and a disposable external fuel tank— carried up to eight astronauts and up to 50,000 lb (23,000 kg) of payload into low Earth orbit (LEO). When its mission was complete, the orbiter would re-enter the Earth's atmosphere and lands as a glider. Although the concept had been explored since the late 1960s, the program formally commenced in 1972 and was the focus of NASA's manned operations after the final Apollo and Skylab flights in the mid-1970s. It started with the launch of the first shuttle Columbia on April 12, 1981, on STS-1. and finished with its last mission, STS-135 flown by Atlantis, in July 2011.