Space Shuttle retirement
The retirement of NASA's Space Shuttle fleet took place from March to July 2011. Discovery was the first of the three active space shuttles to be retired, completing its final mission on March 9, 2011; Space Shuttle Endeavour did so on June 1. The final shuttle mission was completed with the landing of Atlantis on July 21, 2011, bringing about the end of the 30-year Space Shuttle program.
The Shuttle was originally conceived of and presented to the public in 1972 as a 'Space Truck' which would, among other things, be used to build a United States space station in low earth orbit in the early-1990s and then be replaced by a new vehicle. When the concept of the U.S. space station evolved into that of the International Space Station, which suffered from long delays and design changes before it could be completed, the service life of the Space Shuttle was extended several times until 2011 when it was finally retired.
In 2010 the Shuttle was formally scheduled for retirement with Atlantis being taken out of service first after STS-132 in May of that year, but the program was once again extended when the two final planned missions were delayed until 2011. Later, one additional mission was added for Atlantis for July 2011, extending the program further. Counter-proposals to the shuttle's retirement were considered by Congress and the prime contractor United Space Alliance as late as spring 2010.
Hardware developed for the Space Shuttle met various ends with conclusion of the program, including donation, disuse and/or disposal, or reuse. An example of reuse, is that one of the three Multi-Purpose Logistics Module (MPLM) was converted to a permanent module for the International Space Station.
Fate of surviving STS program hardware 
|Enterprise*||OV-101||Intrepid Sea-Air-Space Museum,
New York City, New York
Smithsonian Institution's National Air and Space Museum,
|Atlantis||OV-104||Kennedy Space Center,
Merritt Island, Florida
|Endeavour||OV-105||California Science Center,
Los Angeles, California.
Museums and facilities not selected to receive an orbiter were disappointed. Elected officials representing Houston, Texas, location of the Johnson Space Center; and Dayton, Ohio, location of National Museum of the United States Air Force called for Congressional investigations into the selection process, though no such action has been taken to date. Local and Congressional politicians in Texas questioned if partisan politics played any role in the selection. Chicago media questioned the decision not to include the Adler Planetarium in the list of facilities receiving orbiters, pointing to Chicago's 3rd-largest population in the United States. The chair of the NASA committee that made the selections pointed to the guidance from Congress that the orbiters go to facilities where the most people could see them, and the ties to the space program that Southern California (home to Edwards Air Force Base, where nearly half of shuttle flights have ended and home to the plants which manufactured the orbiters and the Space Shuttle Main Engines), the Smithsonian (curator of the nation's air and space artifacts), the Kennedy Space Center Visitor Complex (where all shuttle launches have originated from and a large tourist draw) and the Intrepid Sea-Air-Space Museum (which served as the recovery ship for Project Mercury and Project Gemini) possess.
The NASA Inspector General released a report on an audit of the selection process for the orbit display locations in August 2011. The report highlighted issues which led to the final decision. The Museum of Flight in Seattle, Washington, March Field Air Museum, Riverside, California, Evergreen Aviation and Space Museum, McMinnville, Oregon, National Museum of the U.S. Air Force, Dayton, Ohio, San Diego Air and Space Museum, San Diego, Space Center Houston, Houston, Texas, Tulsa Air and Space Museum & Planetarium, Tulsa, Oklahoma and U.S. Space and Rocket Center, Huntsville, Alabama scored poorly on international access. Additionally Brazos Valley Museum of Natural History and the Bush Library at Texas A&M, in College Station, Texas scored very poorly on museum attendance, regional population and was the only facility found to pose a significant risk in transporting an orbiter there. Overall, the California Science Center scored first and Brazos Valley Museum of Natural History scored last. The 2 most controversial locations which were not awarded an orbiter, Space Center Houston and National Museum of the U.S. Air Force finished 2nd to last and near the middle of the list respectively. The report noted a scoring error, which if corrected would have placed the National Museum of the U.S. Air Force in a tie with the Intrepid Museum and Kennedy Visitor Complex (just below the California Science Center), although due to funding concerns the same decisions would have been made.
The Museum of Flight in Seattle, Washington was not selected to receive a real orbiter but instead will receive the 3 story full-body trainer from the Space Vehicle Mockup Facility at Johnson Space Center in Houston, TX. Museum officials, though disappointed that they wouldn't receive a space flown orbiter, pointed to plans to allow the public to go inside the trainer, something not possible with a real orbiter.
Payload hardware 
- Spacelab Pallet Elvis – handed over to the Swiss Museum of Transport, Switzerland, in March 2010.
- One of the two Spacelabs—on display at Bremen Airport, Germany.
- MPLM Leonardo – converted to the ISS Permanent Multipurpose Module.
NASA ran a program to donate thermal protection system tiles to schools and universities for $23.40 USD each (the fee for S&H). About 7000 tiles are available on a first-come, first-served basis, but limited to one each per institution. For comparison, each orbiter uses over 24 thousand tiles.
A total of about 42 reusable SSMEs (Pratt & Whitney RS-25/26) have been part of the STS program, with three used per orbiter per mission. The decision was made to retain all engines with plans to make use of them in future launch vehicles
SSME nozzles 
Worn out engine nozzles are typically considered scrap, although nine nozzles may be refurbished for display on the donated orbiters, so the actual engines can be retained by NASA.
Canadarm (SRMS) & OBSS 
Three Shuttle arms were used by NASA; the arms of both Discovery and Atlantis will be left in place for their museum display. Endeavour's arm is to be removed from the orbiter for separate display in Canada. The OBSS extension of Endeavour's arm was left on the International Space Station, for use with the station's robotic arm.
Information technology 
In December 2010, as NASA prepared for the STS program ending, an audit by the NASA Office of Inspector General (OIG) found that information technology had been sold or prepared for sale that still contained sensitive information. NASA OIG recommended NASA be more careful in the future.
Other shuttle hardware 
Kennedy space center launch complex 39A+B: The twin pads originally built for Apollo are now inactive. LC-39B was deactivated first on January 1st 2007. 3 lightning towers were added to the pad and it was temporarily "re-activated" in april 2009 when shuttle Endeavour was placed on stand by to rescue the STS-125 crew (the 125 mission was the last to visit the Hubble telescope so the ISS was out of range) if needed (Endeavour was then moved over to 39A for STS-126), then in October the prototype Ares-1-x rocket was launched off of it. The pad was then permanently deactivated and is now being dismantled and modified for the space launch system rocket. Like the Apollo structures before them, the shuttle structures were scrapped. 39A was deactivated in July 2011 after STS-135 was launched. It remains as it did on July 8th 2011 complete with a mobile launcher platform. On January 16 2013 it was erroniously repoted NASA planned to abandon the pad, but the actual plan was to, like pad B, convert it for other rockets (likely the falcon heavy). If NASA did plan to permanently decommission it they would have to restore it to the Apollo appearance as both pads are on national historic register.
Vehicle assembly building: the building that with LC-39 originally supported Apollo, is now receiving a makeover. The building was used as a storage shed for the decommissioned shuttles before they were sent to museums. High bay 3 is now being gutted of all equipment and given upgraded platforms, to support the space launch system and potentially the Falcon heavy rocket.
Mobile launcher platforms: the twin mobile sections of the pads (again Apollo leftovers) are being modified for the space launch system with a large tower resembling the Apollo era one. Work is expected to be complete by 2016.
Crawler-transporter was deactivated.
Mate-demate devices used to put the shuttle on the carrier 747 were dismantled and scrapped.
Shuttle carrier aircraft two modified 747s used to fly the shuttles back to KSC when they landed at Edwards. N911na was retired on February 8th 2012 and is now a parts hulk for the "SOFIA" 747, the other one, n905na was used to send Discovery, Endeavour and Enterprise to their museums and in September 2012 found to have few parts for Sofia, so it is now destined to be a museum piece in Johnson space center.
NASA recovery Ship used to retrieve the boosters m/v Liberty and Freedom Star are now separated. Liberty Star was transfered to the merchant marine academy in New York for use as a training vessel. It will remain on call in case NASA needs it for further missions. Freedom Star remains at Port Canaveral and is used to video tape Falcon 9 launches.
Shuttle landing facility the runway at KSC is in no danger as its used as a normal runway for the center and neighbouring Cape Canaverals day-to-day operations
Former planned Space Shuttle successors 
In the 1980s and 1990s, one of the planned successors to STS was called "Shuttle II". At one point before retirement, extension of the Space Shuttle program for an additional five years while a replacement can be developed, was considered by the U.S. government.
For comparison to an earlier retirement, when the Saturn IB was last flown in 1975 for the Apollo-Soyuz Test Project, the Shuttle development program was already well underway. However, the Shuttle did not fly until 1981, which left a six-year gap in U.S. manned spaceflight. Because of this and other reasons, the U.S. space station Skylab burned up in the atmosphere.
Constellation Program 
Following the destruction of Space Shuttle Columbia, in early 2004 then President George W. Bush, announced his Vision for Space Exploration which called for the completion of the American portion of the International Space Station by 2010 (due to delays this would not happen until 2011), the retirement of the Space Shuttle fleet following its completion, to return to the moon by 2020 and one day to Mars. A new vehicle would need be developed, it eventually was named the Orion spacecraft, a six person variant would have serviced the ISS and a four person variant would have traveled to the Moon. The Ares I would have launched Orion, and the Ares V heavy-lift vehicle (HLV) would have launched all other hardware. The Altair lunar lander would have landed crew and cargo onto the moon. The Constellation program experienced many cost overruns and schedule delays.
In February 2010, President Barack Obama's administration proposed eliminating public funds for the Constellation program and shifting greater responsibility of servicing the ISS to private companies. During speech at the Kennedy Space Center on April 15, 2010, Obama proposed the design selection of the new HLV that would replace the Ares-V would not occur until 2015. The U.S. Congress drafted the NASA Authorization Act of 2010 and President Obama signed it into law on October 11 of that year. The authorization act officially canceled the Constellation program.
Current and future Space Shuttle successors 
Beyond low Earth orbit 
The NASA Authorization Act of 2010 required a new heavy lift vehicle design to be chosen within 90 days of its passing. The authorization act called this new HLV the Space Launch System (SLS). The Orion spacecraft was left virtually unchanged from its previous design. The Space Launch System will launch both Orion and other necessary hardware. The SLS is to be upgraded over time with more powerful versions. The initial capability of SLS is required to be able to lift 70 mt into LEO, it is then planned to be upgraded to 105 mt and then eventually to 130 mt.
Exploration Flight Test-1 (EFT-1), an unmanned test flight of Orion's crew module, is planned to be launched in 2014 on a Delta IV Heavy rocket. Exploration Mission-1 (EM-1) is the unmanned initial launch of SLS, which is planned for 2017. The first manned flight of Orion and SLS, Exploration Mission-2 (EM-2) is to launch between 2019 and 2021; it is a 10-14 day mission planned to place a crew of four into Lunar orbit. As of March 2012, the destination for EM-3 and the remainder of the focus for this new program is still in-flux.
ISS crew and cargo resupply 
The ISS is planned to be funded until at least 2020. There has been discussion to extend it to 2028 and possibly beyond that. Until another US manned spacecraft is ready, crews will travel to and from the International Space Station exclusively aboard the Russian Soyuz spacecraft.
Commercial Resupply Services 
The Commercial Orbital Transportation Services (COTS) development program began in 2006 with the purpose of creating commercially operated unmanned cargo vehicles to service the ISS. The program is a fixed price milestone-based development program, meaning that each company that received a funded award had have a list of milestones with a dollar value attached to them that they didn't receive until after they had successful completed the milestone. Private companies are also required to have some "skin in the game" which refers raising an unspecified amount of private investment for their proposal.
On 23 December 2008, NASA awarded Commercial Resupply Services contracts to SpaceX and Orbital Sciences Corporation. SpaceX will use its Falcon 9 rocket and Dragon spacecraft. Orbital Sciences will use its Antares rocket and Cygnus spacecraft. The first Dragon resupply mission occurred in May 2012. The first Cygnus resupply mission is expected to occur in early 2013. The CRS program provides for all America's ISS cargo needs; with the exception of a few vehicle-specific payloads that are delivered on the European ATV and the Japanese HTV.
Commercial Crew Program 
The Commercial Crew Development (CCDev) program was initiated in 2010 with the purpose of creating commercially operated manned spacecraft capable of delivering at least four crew members to the ISS, staying docked for 180 days and then returning them back to Earth. Like COTS, CCDev is also a fixed price milestone-based developmental program that requires some private investment.
In the first phase of the program, NASA provided a total of $50 million divided among five American companies, intended to foster research and development into human spaceflight concepts and technologies in the private sector. In 2011, during the second phase of the program, NASA provided $270 million divided among four companies. During the third phase of the program, NASA provided $1.1 billion divided among three companies. This phase of the CCDev program is expected to last from 3 June 2012 to 31 May 2014. The winners of this latest round were SpaceX's DragonRider (derived from the Dragon cargo vehicle), Boeing's CST-100 and Sierra Nevada's Dream Chaser. The United Launch Alliance is working on human-rating their Atlas V rocket as part of the latter two proposals. NASA wants to have two Commercial Crew vehicles in-service, these spacecraft are expected to begin delivering crew around 2017.
See also 
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