| 送交者: csw2002[布衣] 于 2012-11-01 8:27 已读 16 次 | csw2002的个人频道 |
回答: bureau of alcohol tobacco and firearms? (无内容) 由 LandShark 于 2012-11-01 8:07
The Advanced Tactical Fighter (ATF) was a demonstration and validation program undertaken by the United States Air Force to develop a next-generation air superiority fighter to counter emerging worldwide threats, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development in the 1980s.[3] Lockheed and Northrop were selected in 1986 to develop the YF-22 and the YF-23 demonstrator aircraft. These aircraft were evaluated in 1991 and the Lockheed YF-22 was selected and later developed into the F-22 Raptor.
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