Capt. Matthew Thomas, Air Force Joint Test Program Office lead operation research systems analyst from Nellis Air Force Base, Nev., adjusts the gas mask of Master Sgt. Amanda Simonsen, 627th Civil Engineer Squadron commanders support staff section chief from Joint Base Lewis-McChord, Wash., during a chemical warfare class at Shaw AFB, S.C., Feb. 21, 2017. As part of their third week of training, the Rear Mission Support Element course students complete individual readiness tasks including chemical warfare and small arms qualification. (U.S. Air Force photo by Senior Airman Diana M. Cossaboom)
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