Staff Sgt. Blaine Erway, 99th Civil Engineer Squadron firefighter crew chief, adjusts his gas mask before entering a simulated house fire during Red Flag 17-3 at Nellis Air Force Base, Nev., July 18, 2017. Red Flag helps the firefighters train on and off the flightline to put their life-saving skills to the test. (U.S. Air Force photo by Airman 1st Class Andrew D. Sarver/Released)
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