Fifty caliber machine gun rounds feed into an M2 .50-caliber

Fifty caliber machine gun rounds feed into an M2 .50-caliber Browning machine gun during training at Camp Schwab, Okinawa, Japan, June 1, 2017. Marines with Weapons Company, Battalion Landing Team, 3rd Battalion, 5th Marines, test fired and calibrated a variety of heavy weapons during the training. The M2, sometimes called the "Ma Deuce," is the oldest machine gun currently in the Marine Corps' arsenal. BLT 3/5 is currently deployed as the Ground Combat Element of the 31st Marine Expeditionary Unit. Weapons Company is the heavy-weapons element of BLT 3/5. Their arsenal includes heavy machine guns, mortars, and anti-tank weapons. (Official U.S. Marine Corps photo by Staff Sgt. T. T. Parish/Released)