Senior Airman Christopher Robnett, 28th Operations Support Squadron aircrew flight equipment technician, instructs Col. Kevin Kennedy, 28th Bomb Wing commander, on the proper procedure for decontaminating the mask and helmet during an aircrew chemical defense ensemble training at Ellsworth Air Force Base, S.D., May 29, 2014. The mask wipe and helmet decontamination station helps prevent the spread of contaminants. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)