Senior Airman Collin Chase, 23d Maintenance Squadron aircraft fuels systems journeyman, tightens the barrel locks on the hood of his overcoat, Feb. 1, 2018, at Moody Air Force Base, Ga. Airmen participated in a chemical, biological, radiological and nuclear defense (CBRNE) class to better prepare them to combat enemy attacks while also familiarizing them with mission-oriented protective posture (MOPP) gear. (Air Force

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