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This undated photo released Thursday, May 30, 2013 by aerospace technology company Northrop Grumman shows the RQ-4 Block 20 Global Hawk unmanned aircraft that students in the University of North Dakota aviation program will learn to fly. (AP Photo/Courtesy of Northrup Grumman)

This undated photo released Thursday, May 30, 2013 by aerospace technology company Northrop Grumman shows the RQ-4 Block 20 Global Hawk unmanned aircraft that students in the University of North Dakota aviation program will learn to fly. (AP Photo/Courtesy of Northrup Grumman)

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