GRISSOM AIR RESERVE BASE, Ind., -- Senior Airman Robert Johnston, 434th Maintenance Squadron, is being instructed by Senior Airman Cathrine Shinabarger, emergency management readiness specialist, on the proper way to change out a filter canister on his gas mask. Members of the 434th Air Refueling Wing participate in a variety of training activities and events each month. (U.S. Air Force Photo/Tech. Sgt. Patrick Kuminecz)
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