U.S. Air Force Master Sgt. Dan Mattson from the 446th Civil Engineer Squadron, McChord Field, Wash., leans in the cab of a heavy duty excavator to assist U.S. Air Force Airman 1st Class Cory Summers from the 341st CES, Malmstrom Air Force Base, Mont., during a field exercise at Tyndall Air Force Base, Fla. on March 23, 2011. U.S. Air Force Tech Sgt. Wesley McCord (in red hat) from the 823rd Training Detachment, Tyndall AFB, Fla., is the course instructor. Sergeant Mattson is one of 30 Reservists from the 446th CES participating in Silver Flag 2011, a training exercise designed to improve the readiness capability of Air Force civil engineers. (U.S. Air Force photo by Staff Sgt. Grant Saylor/Released)
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