U.S. Air Force Airman 1st Class Kaitlyn Brewer stands with a gas mask for 20th Security Forces Squadron training in Sumter, S.C., March 6, 2019. 20th SFS defenders have to train with M-4 rifles and gas masks on for their deployments downrange and be qualified to carry them during their daily duties of defending Shaw. (U.S. Air Force photo by Senior Airman Christopher Maldonado.)
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