U.S. Air Force Senior Airman Jason Pincheon, 633rd Civil Engineer Squadron fire protection journeyman, runs a fire pump water supply during a simulated fuel spill exercise at Langley Air Force Base, Va., July 31, 2014. Fuel spill exercises are performed to ensure first-responders know the appropriate steps to contain a spill in case a real-world incident occurs. (U.S. Air Force photo by Senior Airman Aubrey White/Released)(This photo was cropped and levels were adjusted to emphasize the subject)