Over the weekend, militants tried but failed to blast their way into an American base in eastern Afghanistan, striking before dawn with rocket-propelled grenades and a car bomb.

上周末，武装人员在黎明前发动袭击，试图用火箭筒和汽车炸弹炸出一条通往阿富汗东部地区一个美国基地的路，但最终失败了。

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Last year, in its most recent test, the X-51 fell for about four seconds before its booster rocket ignited, but the aircraft failed to separate from the rocket and plunged into the ocean.

MSN: Hypersonic aircraft taken out for a trial run on B-52 bomber