Staff Sgt. Jeremy Breillatt, emergency management craftsman with the 319th Civil Engineer Squadron, left, puffs stannic chloride gas towards Tech. Sgt. Andres Dominguez, noncommissioned officer in charge of relocations with the 319th Force Support Squadron, to test the seal of his gas mask during a readiness competition May 18, 2018, on Grand Forks Air Force Base, North Dakota. Airmen were tested on their ability to put on mission oriented protective posture gear, in addition to providing self-aid and buddy care, weapons assembly and map-reading during the competition. (U.S. Air Force photo by Airman 1st Class Elora J. Martinez)
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