Browning Machine Gun
The Browning M1919 is a .30 caliber medium machine gun family widely used during the 20th century. It was used as a light infantry, coaxial, mounted, aircraft, and anti-aircraft machine gun by the U.S. and many other countries, especially during World War II, the Korean War, and the Vietnam War. Although it began to be superseded by newer designs in the later half of the century (such as by the M60 machine gun), it remained in use in many North Atlantic Treaty Organization (NATO) countries and elsewhere for much longer. It is very similar in design to the larger .50-caliber M2 Machine Gun, which is also a Browning-designed weapon and is still in NATO service.
War Department Pamphlet: Army Life (Washington D.C., : United States Government Printing Office, 1944)