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A U.S. soldier from the 3rd Cavalry Regiment shields himself from the rotor wash of a UH-60 Blackhawk helicopter after being dropped off for a mission with the Afghan police near Jalalabad in the Nangarhar province of Afghanistan December 20, 2014. REUTERS/Lucas Jackson (AFGHANISTAN - Tags: TRANSPORT CIVIL UNREST MILITARY POLITICS TPX IMAGES OF THE DAY) - RTR4IRXO © Lucas Jackson / Reuters