An amphibious assault vehicle crewman with Alpha Company, 2nd Assault Amphibian Battalion, loads simulation rounds into a mounted MK-19 40mm grenade launcher during a live-fire gunnery range at Marine Corps Base Camp Lejeune, North Carolina, July 27, 2016. Marines with the battalion spent the day refining their marksmanship skill as individuals and their ability to work as a crew. - An amphibious assault vehicle crewman with Alpha Company, 2nd Assault Amphibian Battalion, loads simulation rounds into a mounted MK-19 40mm grenade launcher during a live-fire gunnery range at Marine Corps Base Camp Lejeune, North Carolina, July 27, 2016. Marines with the battalion spent the day refining their marksmanship skill as individuals and their ability to work as a crew.

Marines with 8th Engineer Support Battalion, 2nd Marine Logistics Group fire at targets over 300 meters away with the M2 .50-caliber machine gun during a live-fire training exercise at a multipurpose machine gun range at Marine Corps Base Camp Lejeune, North Carolina, April 14, 2015. The hard work, time and effort put into the training helps the Marine Corps maintain mission readiness consistently by providing Marines with knowledge and experience, and strengthens their ability to work effectively in real situations by maintaining unit cohesion, said Bradley Marsh, an 8th ESB motor transportation Marine. - Marines with 8th Engineer Support Battalion, 2nd Marine Logistics Group fire at targets over 300 meters away with the M2 .50-caliber machine gun during a live-fire training exercise at a multipurpose machine gun range at Marine Corps Base Camp Lejeune, North Carolina, April 14, 2015. The hard work, time and effort put into the training helps the Marine Corps maintain mission readiness consistently by providing Marines with knowledge and experience, and strengthens their ability to work effectively in real situations by maintaining unit cohesion, said Bradley Marsh, an 8th ESB motor transportation Marine.

Marines with Charlie Company, 1st Reconnaissance Battalion, await extraction in a field during a live-fire raid at Range 226 aboard Camp Pendleton, Calif., April 1, 2015. The company conducted the live-fire exercise as part of a predeployment workup in support of the 13th Marine Expeditionary Unit. - Marines with Charlie Company, 1st Reconnaissance Battalion, await extraction in a field during a live-fire raid at Range 226 aboard Camp Pendleton, Calif., April 1, 2015. The company conducted the live-fire exercise as part of a predeployment workup in support of the 13th Marine Expeditionary Unit.