Northern Strike 2013
U.S. Air Force Master Sgt. Chuck L. Barth, a tactical air control party specialist with the 182nd Air Support Operations Group, checks a training bundle from an airdrop with a C-130 Hercules at Grayling Gunnery Range during Exercise Northern Strike 2013 in Grayling, Mich., Aug. 6, 2013. Exercise Northern Strike 2013 is a joint multi-national combined arms training exercise conducted in northern Michigan. (U.S. Air National Guard photo by Master Sgt. Scott Thompson/released)