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Armed unmanned aircraft a threat to US military in near future

A Navy X-47B Unmanned Combat Air System Demonstration aircraft takes off and flies for the first time Feb. 4, 2011, at Edwards Air Force Base, Calif.
A Navy X-47B Unmanned Combat Air System Demonstration aircraft takes off and flies for the first time Feb. 4, 2011, at Edwards Air Force Base, Calif.
U.S. Air Force
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