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1989年12月20日凌晨,美军的两个中队 F-117A隐形战斗轰炸机,躲过昼夜处于高度戒备状态的巴拿马对空监视雷达系统,突然出现在巴拿马城西120公里处的一个军用机场上空,为美军大规模入侵巴拿马夺取了制空权.F-117A 是美国研制的一种隐形作战飞机。美国对隐形飞机的研制、试飞和部队飞行训练一直是在高度保密状态下进行的.经过近十年的秘密研制,B-2隐形
In the early hours of 20 December 1989, two U.S. squadrons, the F-117A stealth fighter-bombers, escaped the heavily circadian radar surveillance system in Panama and suddenly appeared above a military airfield 120 kilometers west of Panama City as The U.S. invasion of Panama captured the airpower, and the F-117A was a stealth combat aircraft developed by the United States. The development of the U.S. stealth aircraft, flight test and training of troops have been carried out in a highly confidential state. After nearly a decade of secret development, the B-2 was invisible