U.S. Army 1st Lt. Alex Mumford, 82nd Airborne Division 3rd Brigade Combat Team signal officer, conducts a radio test following an air-to-ground jump May 31, 2013, during the Joint Forcible Entry Exercise on the Nevada Test and Training Range, Nev. The exercise is the U.S. Air Force Weapons School biannual collaboration that, according to an Air Force fact sheet, exercises the Air Force's ability to tactically deliver and recover combat forces via air drops and combat landings in a contested environment. (U.S. Air Force photo by Staff Sgt. Michael Charles)
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