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Lockheed Martin F-22 Raptor
The Lockheed Martin F-22 Raptor is a single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF). The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily as an air superiority fighter, but has additional capabilities including ground attack, electronic warfare, and signals intelligence roles.〔Reed, John. ("Official: Fighters should be used for spying." ) ''Air Force Times'', 20 December 2009. Retrieved: 9 May 2010.〕 Lockheed Martin is the prime contractor and was responsible for the majority of the airframe, weapon systems, and final assembly of the F-22, while program partner Boeing provided the wings, aft fuselage, avionics integration, and training systems.
The aircraft was variously designated F-22 and F/A-22 prior to formally entering service in December 2005 as the F-22A. Despite a protracted development as well as operational issues, the USAF considers the F-22 a critical component of its tactical air power, and states that the aircraft is unmatched by any known or projected fighter.〔("F-22 Raptor fact sheet." ) ''U.S. Air Force'', March 2009. Retrieved: 23 July 2009.〕 The Raptor's combination of stealth, aerodynamic performance, and situational awareness gives the aircraft unprecedented air combat capabilities.〔Pace 1999, p. 95.〕〔Aronstein and Hirschberg 1998, p. 254.〕
The high cost of the aircraft, a lack of clear air-to-air missions due to delays in Russian and Chinese fighter programs, a ban on exports, and development of the more versatile and lower cost F-35 led to the end of F-22 production. A final procurement tally of 187 operational production aircraft was established in 2009 and the last F-22 was delivered to the USAF in 2012.
==Development==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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