(From left) U.S. Air Force Airman 1st Class Patrick, deployed from Davis-Monthan Air Force Base, Ariz., and Senior Airman Matthew, 577th Expeditionary Prime Base Engineer Emergency Force Squadron troops constructions, pour cement for a new airfield security fence at Bagram Airfield, Afghanistan May 24, 2014. D-M AFB Airmen created an innovative tool, named the Blue Line Tracker, for leadership to track their Airmen downrange. The tracker is now being used at multiple bases across Air Combat Command. (U.S. Air Force photo by Staff Sgt. Evelyn Chavez/Released)
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