Capt. Nick Berger, project officer in Infantry Weapons at Marine Corps Systems Command, holds the M320A1 during a weeklong review of the system. - Capt. Nick Berger, project officer in Infantry Weapons at Marine Corps Systems Command, holds the M320A1 during a weeklong review of the system.

Marines perform ‘arduous’ evaluation of new grenade launcher - A Marine prepares to shoot an M320 mounted on an M4 rifle at Camp Lejeune, North Carolina, June 6, 2017. In March 2019, Marine Corps Systems Command’s Ground Combat Element Systems examined the M320A1 to ensure the operator and maintenance technical publications of the system are accurate. (U.S. Marine Corps photo by LCpl. Taylor W. Cooper)

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.

Cpl. Sierra K. Tilson, rifleman with 3rd Platoon, Company A, Ground Combat Element Integrated Task Force, fires the M203 grenade launcher during a live-fire range at the Verona Loop training area, near Marine Corps Base Camp Lejeune, North Carolina, Jan. 14, 2015. Marines with Co. A conducted live-fire training, squad attacks, and patrolling in preparation for their upcoming assessment at Marine Corps Air Ground Combat Center Twentynine Palms, California. From October 2014 to July 2015, the GCEITF will conduct individual and collective level skills training in designated ground combat arms occupational specialties in order to facilitate the standards based assessment of the physical performance of Marines in a simulated operating environment performing specific ground combat arms tasks. - Cpl. Sierra K. Tilson, rifleman with 3rd Platoon, Company A, Ground Combat Element Integrated Task Force, fires the M203 grenade launcher during a live-fire range at the Verona Loop training area, near Marine Corps Base Camp Lejeune, North Carolina, Jan. 14, 2015. Marines with Co. A conducted live-fire training, squad attacks, and patrolling in preparation for their upcoming assessment at Marine Corps Air Ground Combat Center Twentynine Palms, California. From October 2014 to July 2015, the GCEITF will conduct individual and collective level skills training in designated ground combat arms occupational specialties in order to facilitate the standards based assessment of the physical performance of Marines in a simulated operating environment performing specific ground combat arms tasks.