While they're not supersonic like some jet airplanes, many military helicopters fly through the skies at breakneck speeds.

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The jet will be an unmanned hypersonic aircraft. Lockheed claims ... it may not be long before the fastest plane ever hits the skies. More from Military & Defense In 2013, Lockheed Martin ...

Many of the U.S.' fastest drones are still in development ... greater endurance than many UCAVs operated by the U.S. military ...