U.S. Air Force firefighters open a valve on a hydrant in order to prepare an engine for a simulated aircraft fire during a training exercise at Tyndall Air Force Base, Fla. on May 25. More than 170 trainees, including 30 Reservists from the 446th Civil Engineering Squadron, are participating in Silver Flag 2011, a week-long 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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