Marines fire a Mark 19 automatic grenade launcher from the turret of a Humvee at Camp Schwab, Okinawa, Japan, June 1, 2017. The Marines are assigned to Weapons Company, Battalion Landing Team, 3rd Battalion, 5th Marines. The Mark 19 is designed to suppress and destroy enemy threats, and fires 40 mm high-explosive grenades at up to 375 rounds a minute. Marine Corps photo by Staff Sgt. T. T. Parish