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U.S. Air Force Staff Sgt. Linda Kosterman, a security forces member with the 128th Air Refueling Wing, Wisconsin Air National Guard, falls into a pool after attempting to cross a pool using limited resources during an exercise at the Leadership Development Course at Volk Field Combat Readiness Training Center (CRTC), Wis., June 12, 2013. Members of the 128th Security Forces Squadron conducted annual training at Volk Field CRTC. (U.S. Air National Guard photo by Staff Sgt. Jenna Hildebrand/Released)