U.S. Air Force Airman 1st Class Andrew Timler, 509th Security Forces Squadron security forces apprentice from Whiteman Air Force Base, Mo., packs his rucksack 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, which is designed to train armed forces personnel to conduct combat operations within enemy lines. (U.S. Air Force photo by Airman 1st Class George Goslin/Released)
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