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Defenders train for Guardian Challenge
VANDENBERG AIR FORCE BASE, Calif. - Climbing up a rope, Senior Airman Erick Caldwell, of the 30th Security Forces Squadron, trains for Guardian Challenge at the old base gym here Tuesday, April 13, 2010. Guardian challenge is a bi annual space and missiles competition. (U.S. Air Force photo/Senior Airman Christopher Hubenthal)

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