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A sixth-generation jet fighter is a conceptualized class of fighter aircraft design more advanced than the fifth-generation jet fighters which are currently in service in the United States and in development in other countries. The United States Air Force and United States Navy are anticipated to field their first sixth-generation fighters in the 2025–30 time frame.〔.〕 The USAF is pursuing development and acquisition of a sixth-generation fighter through the F-X program to replace the F-22 Raptor, and the U.S. Navy is pursuing a similar program called the Next Generation Air Dominance to replace the F/A-18E/F Super Hornet.〔.〕 ==History== On October 10, 2012, Under Secretary of Defense for Acquisition, Technology and Logistics Frank Kendal justified the need to start the program.〔.〕 In April 2013, DARPA started a study to try to bridge the USAF and USN concepts. The Pentagon 2015 budget request has studies to lead to an acquisition program in fiscal year 2018. Frank Kendal revealed that funding for initial sixth generation fighter development would be requested in the FY 2016 budget. Next-generation fighter efforts will initially be led by DARPA under the "Air Dominance Initiative" to develop prototype X-planes. The agency as well as industry are known to have started internal research on potential sixth generation technologies for several years. Kendall confirmed that Navy and Air Force will each have variants focused on their mission requirements.〔(New Budget Will Feature 6th Gen Fighter ) - Defensenews.com, 28 January 2015〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sixth-generation jet fighter」の詳細全文を読む スポンサード リンク
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