Master Sgt. Donald Johnson prepares M67 fragmentation grenades during a grenade and MK-19 Grenade Launcher range at Marine Corps Base Camp Lejeune, N.C., Oct. 28, 2015. More than 70 Marines with 2nd Low Altitude Air Defense Battalion took turns handling the MK19 and handheld grenades during the familiarization range. The range offered Marines the opportunity to build confidence and proficiency skills on some of the crew-served weapons they operate while providing security in a deployed environment. Johnson is the 24th Marine Expeditionary Unit Detachment staff noncommissioned officer in charge with the battalion. - Master Sgt. Donald Johnson prepares M67 fragmentation grenades during a grenade and MK-19 Grenade Launcher range at Marine Corps Base Camp Lejeune, N.C., Oct. 28, 2015. More than 70 Marines with 2nd Low Altitude Air Defense Battalion took turns handling the MK19 and handheld grenades during the familiarization range. The range offered Marines the opportunity to build confidence and proficiency skills on some of the crew-served weapons they operate while providing security in a deployed environment. Johnson is the 24th Marine Expeditionary Unit Detachment staff noncommissioned officer in charge with the battalion.