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AIR FORCE PHOTOS

Security Forces Guardian Challenge

Senior Airman Alberto Lopez races down an obstacle course trail May 18, 2010, during the security forces competition at the U.S. Air Force Academy, Colo. He is a 50th Security Forces Squadron Guardian Challenge contender. Guardian Challenge is Air Force Space Command's premier bi-annual competition to determine the best units within the command. (U.S. Air Force photo/Dennis Rogers

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