U.S. Marine Corps Master Gunnery Sgt. Jeffery Davis, 26th Marine Expeditionary Unit (MEU) operations chief, traverses an obstacle during the 26th MEU's chemical biological radiological and nuclear (CBRN) defense training aboard Camp Lejeune, N.C., March 11, 2014. The training consisted of classroom instruction and an obstacle course to familiarize Marines with CBRN defense equipment and procedures. (U.S. Marine Corps photo by Lance Cpl. Joshua W. Brown/Released)