Airmen of the 99th Security Forces Squadron run together during the U.S. Air Force’s 66th Birthday 5 kilometer run Sept. 18, 2013, at Nellis Air Force Base, Nev. The origins of the USAF started with the U.S Army Signal Corps Aeronautical Division, a three person unit created in August 1907 to take charge of matters pertaining to military ballooning. (U.S. Air Force photo by Senior Airman Matthew Lancaster)
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