U.S. Air Force Master Sgt. Dan Mattson (right) 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. 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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