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)