A Marine with 3rd Battalion, 6th Marine Regiment advances down range during a battalion exercise at Camp Lejeune, N.C., Dec. 10, 2015. The battalion-wide exercise reinforced basic infantry skills and brought junior Marines up to optimal operability across the companies. (U.S. Marine Corps photo by Cpl. Paul S. Martinez/Released) - A Marine with 3rd Battalion, 6th Marine Regiment advances down range during a battalion exercise at Camp Lejeune, N.C., Dec. 10, 2015. The battalion-wide exercise reinforced basic infantry skills and brought junior Marines up to optimal operability across the companies. (U.S. Marine Corps photo by Cpl. Paul S. Martinez/Released)

Lance Cpl. Joe Escobedo, a rifleman with Golf Company, 2nd Battalion, 2nd Marine Regiment, looks toward a target after conducting a squad attack aboard Camp Lejeune, N.C., July 28. The training incorporated multiple weapon systems, including the M16A4 service rifle, M203 grenade launcher, Shoulder-launched Multipurpose Assault Weapon and M249 Squad Automatic Weapon to help increase interoperability between weapons in training operations. ( - Lance Cpl. Joe Escobedo, a rifleman with Golf Company, 2nd Battalion, 2nd Marine Regiment, looks toward a target after conducting a squad attack aboard Camp Lejeune, N.C., July 28. The training incorporated multiple weapon systems, including the M16A4 service rifle, M203 grenade launcher, Shoulder-launched Multipurpose Assault Weapon and M249 Squad Automatic Weapon to help increase interoperability between weapons in training operations. (