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Defenders train for Guardian Challenge
VANDENBERG AIR FORCE BASE, Calif. -Staff Sgt. Domonic Buzzelli, of the 30th Security Forces Squadron, flips a tire during training for Guardian Challenge at the old base gym here Tuesday, April 13, 2010. Team exercises include resistance runs, tire flips, box jumps, and rope climbs. (U.S. Air Force photo/Senior Airman Christopher Hubenthal)

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