KENNEDY SPACE CENTER, Fla. -- Workers watch the rollback of the Rotating Service Structure (left) from around Space Shuttle Discovery on Launch Pad 39B. Poised above the orange external tank is the Gaseous Oxygen Vent Arm with the “beanie cap,” a vent hood. The RSS provides protected access to the orbiter for changeout and servicing of payloads. It is supported by a rotating bridge that pivots about a vertical axis on the west side of the pad’s flame trench. Space Shuttle Discovery is scheduled to launch March 8 at 6:42 a.m. EST on the eighth construction flight to the International Space Station. It carries the Multi-Purpose Logistics Module Leonardo, the primary delivery system used to resupply and return Station cargo requiring a pressurized environment. Leonardo will deliver up to 10 tons of laboratory racks filled with equipment, experiments and supplies for outfitting the newly installed U.S. Laboratory Destiny KSC01pp0441

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CAPE CANAVERAL, Fla. – This wide-angle view shows the space shuttle Atlantis as it enters Bay 2 of the Orbiter Processing Facility OPF at NASA's Kennedy Space Center in Florida. Atlantis is switching places with Endeavour that moved into the Vehicle Assembly Building. In the OPF, Atlantis will undergo final preparations for its transfer to the Kennedy Space Center Visitor Complex targeted for November. The work is part of Transition and Retirement of the remaining space shuttles, Atlantis and Endeavour. Atlantis is being prepared for public display at Kennedy's Visitor Complex. Over the course of its 26-year career, Atlantis spent 293 days in space during 33 missions. For more information, visit http://www.nasa.gov/transition Photo credit: NASA/Kim Shiflett KSC-2012-4537

CAPE CANAVERAL, Fla. -- Space shuttle Discovery atop the mobile launcher platform moves on the crawler-transporter through the doors of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida on its way to Launch pad 39A. First motion was at 5:17 a.m. EST. Discovery is targeted to launch to the International Space Station Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and its solar arrays to the starboard side of the station, completing the station's backbone, or truss, enabling a six-person crew to live there starting in May. Photo credit: NASA/Troy Cryder KSC-2009-1115

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center, access arms from the fixed service structure at Launch Pad 39A are extended toward space shuttle Discovery, secured atop the mobile launch platform below, as final prelaunch processing for the STS-124 mission gets under way at the pad. The 3.4-mile journey from the Vehicle Assembly Building began at 11:47 p.m. on May 2. The shuttle arrived at the launch pad at 4:25 a.m. EDT May 3 and was secured, or hard down, by 6:06 a.m. On the 13-day mission, Discovery and its crew will deliver the Japan Aerospace Exploration Agency's Japanese Experiment Module – Pressurized Module and the Japanese Remote Manipulator System. Launch is targeted for May 31. Photo credit: NASA/Troy Cryder KSC-08pd1107

STS-131 Discovery Lift & Mate to SRB/ET Stack 2010-1903

KENNEDY SPACE CENTER, FLA. -- Space Shuttle Discovery and the mobile launcher platform sit on Launch Pad 39B for mission STS-116. The shuttle's external tank is capped by the oxygen vent hood (at top). Below it is the orbiter access arm which swings out from the fixed service structure to the orbiter crew compartment hatch to allow personnel to enter the crew compartment. The outer end of the access arm ends in an environmental chamber (white room) that mates with the orbiter and holds six persons. The arm remains in the extended position until seven minutes 24 seconds before launch to provide emergency egress for the flight crew. At right, the U.S. flag flies at half-staff in accordance with special Presidential Proclamation No. 3044, due to the death of Senior Border Patrol Agent David N. Webb. The rollout of Discovery from the Vehicle Assembly Building began at 12:29 a.m. The shuttle was harddown on the pad at 9:03 a.m. 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. The launch window for mission STS-116 opens Dec. 7. Photo credit: NASA/George Shelton KSC-06pd2490

STS-28 Columbia, OV-102, night time processing at KSC LC Pad 39B

KENNEDY SPACE CENTER, Fla. -- Workers watch the rollback of the Rotating Service Structure (left) from around Space Shuttle Discovery on Launch Pad 39B. Poised above the orange external tank is the Gaseous Oxygen Vent Arm with the “beanie cap,” a vent hood. The RSS provides protected access to the orbiter for changeout and servicing of payloads. It is supported by a rotating bridge that pivots about a vertical axis on the west side of the pad’s flame trench. Space Shuttle Discovery is scheduled to launch March 8 at 6:42 a.m. EST on the eighth construction flight to the International Space Station. It carries the Multi-Purpose Logistics Module Leonardo, the primary delivery system used to resupply and return Station cargo requiring a pressurized environment. Leonardo will deliver up to 10 tons of laboratory racks filled with equipment, experiments and supplies for outfitting the newly installed U.S. Laboratory Destiny KSC01pp0441

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KENNEDY SPACE CENTER, Fla. -- Workers watch the rollback of the Rotating Service Structure (left) from around Space Shuttle Discovery on Launch Pad 39B. Poised above the orange external tank is the Gaseous Oxygen Vent Arm with the “beanie cap,” a vent hood. The RSS provides protected access to the orbiter for changeout and servicing of payloads. It is supported by a rotating bridge that pivots about a vertical axis on the west side of the pad’s flame trench. Space Shuttle Discovery is scheduled to launch March 8 at 6:42 a.m. EST on the eighth construction flight to the International Space Station. It carries the Multi-Purpose Logistics Module Leonardo, the primary delivery system used to resupply and return Station cargo requiring a pressurized environment. Leonardo will deliver up to 10 tons of laboratory racks filled with equipment, experiments and supplies for outfitting the newly installed U.S. Laboratory Destiny

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.