U.S. Marine Corps Lance Cpl. Derek M. Krohnke, an administrative clerk assigned to Marine Aircraft Group 14, sets up a tent during a training exercise aboard Atlantic Airfield, N.C., Aug. 6, 2014. Marines with the Chemical Biological Radiological Nuclear response unit practiced reconnaissance and extraction scenarios designed to simulate real life situations. (U.S. Marine Corps photo by Lance Cpl. Jodson B. Graves/Released)