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Firefighters from Yokota Air Base, Japan, standby at the simulated flashover trainer during joint training with firefighters from Marine Corps Air Station Iwakuni July 30, 2013, at Yokota AB. The training involved educating and recognizing the signs of a flashover, which is incredibly dangerous to firefighters, in a controlled training environment. (U.S. Air Force photo/Airman 1st Class Soo C. Kim)