U.S. Army Spc. Kevin Smith with the 108th Chemical

U.S. Army Spc. Kevin Smith with the 108th Chemical Company, South Caronlina Army National Guard, simulates decontaminating a vehicle during the exercise Ardent Sentry in Ridgeland, S.C., May 19, 2013. Ardent Sentry is a North American Aerospace Defense Command and U.S. Northern Command(USNORTHCOM)-directed exercise focusing on defense support of civil authorities in response to simulated weather, security and disaster contingencies. While Ardent Sentry is primarily a command post exercise, several field training events were conducted at various locations within the USNORTHCOM area of responsibility. (U.S. Air National Guard photo by Tech. Sgt. Caycee Watson/Released)