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SCOTT AIR FORCE BASE, Ill. -- Chief Master Sgt. Jeff Vaughn, 375th Civil Engineer Squadron Fire Chief, briefs emergency personnel on the status of a simulated fuel spill during an exercise at Scott on Monday. Chief Vaughn was the on-scene commander in charge of directing personnel to where they are needed. The exercise was put on to help prepare emergency agencies on base in the event of a real world incident. (U.S. Air Force photo/Senior Airman Brian Ellis)