VANDENBERG AIR FORCE BASE, Calif. - Airman 1st Class Tim Prieto, of the 30th Security Forces Squadron, works out by executing sets of box jumps during training for Guardian Challenge at the old base gym here Tuesday, April 13, 2010. Security forces guardian challenge team members are selected by a physical fitness tryout and must possess outstanding shooting scores. (U.S. Air Force photo/Senior Airman Christopher Hubenthal)
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