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An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft

Reuters
An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft
An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned aircraft. REUTERS/U.S. Air Force/Bobbi Zapka/Handout
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