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Fifth-generation jet fighter
A fifth-generation jet fighter is a jet fighter classification used around the world which encompasses the most advanced jet fighter generation . Fifth-generation aircraft are designed to incorporate numerous technological advances over the fourth-generation jet fighter. The exact characteristics of fifth-generation jet fighters are controversial and vague, with Lockheed Martin defining them as having all-aspect stealth even when armed, low probability of intercept radar (LPIR), high-performance airframes, advanced avionics features, and highly integrated computer systems capable of networking with other elements within the battlespace for situation awareness.〔("F-35 Defining the Future" ) ''Lockheed Martin'', 1 June 2012.〕
Currently, the only combat-ready fifth-generation fighter is the Lockheed Martin F-22 Raptor, which entered service with the United States Air Force in 2005.〔(5TH Generation Fighters ), Lockheed Martin. Retrieved 15 April 2009.〕〔(Russia trails U.S. in pursuit of a fifth-generation jet )〕〔(A 21st-century Concept of Air and Military Operations by Robbin F. Laird )〕 The Lockheed Martin F-35 Lightning II, Sukhoi PAK FA, HAL AMCA, TAI TFX, Chengdu J-20 and Shenyang J-31 are currently under various stages of testing and development.
==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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