Army Reserve Sgt. Tony Rollison, a Chemical, Biological, Radiological, and Nuclear Non-Commissioned Officer from the 300th Special Troops Battalion, 300th Sustainment Brigade, 4th Sustainment Command (Expeditionary), prepares the gas chamber during a Deployment Readiness Exercise at the Seagoville, TX, Armed Forces Reserve Center Dec. 10, 2017. Deployment Readiness Exercises are used to gauge Soldier readiness, identify unit strengths and weaknesses, and to prepare Soldiers for short notice deployments. ( Army Reserve photo by Capt. Jose L. Caballero Jr.)

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