Army Soldiers assigned to 749 Combat Sustainment Support Battalion sustain a chemical attack in a simulated combat environment during Decisive Action Rotation 20-02 at the National Training Center in Fort Irwin, Calif., November 4, 2019. Decisive Action Rotations at the National Training Center ensure Army Brigade Combat Teams remain versatile, responsive, and consistently available for current and future contingencies. ( Army photo by Sgt. Nathan Franco, Operations Group, National Training Center)

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Keywords: attack, base, cbrn, cs, gas, grenade, nbc, smoke