U.S. Air Force Airman 1st Class Andrew Timler, 509th Security Forces Squadron security forces apprentice, Whiteman Air Force Base, Mo., mentally prepares for a training mission during the Ranger Assessment and Selection course, Oct. 21, 2011, at the Nevada Test and Training Range. Airmen must attend the RAS course before going  to the U.S. Army Ranger School, designed to train armed forces personnel to conduct combat operations within enemy lines.
Airman 1st Class Daniel Hughes
Taken on 21 October 2011
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