KENNEDY SPACE CENTER, FLA. -- At the Shuttle Landing Facility, STS-116 Mission Specialist Christer Fuglesang poses for the media after his arrival at KSC. Fugelsang, who is from Sweden, represents the European Space Agency. The crew has returned to KSC for the terminal countdown demonstration test, which are prelaunch preparations that include a simulated launch countdown. Other crew members are Commander Mark Polansky, Pilot William Oefelein and Mission Specialists Sunita Williams, Joan Higginbotham, Nicholas Patrick and Robert Curbeam. The mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Kim Shiflett KSC-06pd2512

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.