U.S. Marines with 2nd Amphibious Assault Battalion, 2nd Marine Division (MARDIV) set up a 360 degree security position during a helicopter training exercise on Training Landing Zone Osprey, Camp Lejeune, N.C., March 18, 2014. The exercise was conducted to enhance the Marines' proficiency during casualty evacuations in a simulated combat situation. (U.S. Marine Corps Photo by Cpl. Nicholas T. Nohalty, 2nd MARDIV, Combat Camera/Released)