WEAPONS OF THE WORLD WAR II GYRENE
M1919A4 Light Machine Gun
The M1919A4 was the Marine Corps' primary light machine gun for more than 30 years. It served in many roles, including as an infantry support weapon, tank machine gun, and in several types of aircraft. Known as the "light .30," this weapon delivered unsurpassed reliability and firepower across the demanding battlefields of World War II.
During the First World War, famed weapons designer John Browning and his team developed the M1917 heavy .30 caliber machine gun. This gave infantry battalions a weapon capable of firing thousands of rounds in a short period. The "heavy .30" performed this duty in an outstanding manner. But weighing 93 pounds, it was bulky and awkward to carry on patrols and in the assault.
In 1918 the US Army Ordnance Department issued a requirement for a light machine gun to equip the newly organized Tank Corps. A weapon was needed that would fit in the tank and the M1917 with its water jacket did not fit. The Ordnance Corps modified the M1917 and the M1919 tank machine gun was the result.
Through the 1920s and 30s, development continued on the M1919. The US Army Infantry Board issued a requirement in the late 1920s for an air-cooled infantry machine gun. By the mid-1930s, the final modifications were complete and the M1919A4 was adopted as the standard light machine gun in the US Army and Marine Corps.
Rock Island Arsenal was the primary manufacturer of the light .30s procured before World War II. During the war, several companies built M1919A4s with a total production of almost 390,000 weapons built. The primary contractor was the Saginaw Steering Division of General Motors.
In the Marine Corps, the light .30 was the primary machine gun in the rifle company. This weapon was one of the anchors of the company's fire support. Under the D-series T/O, two light .30s were assigned to the light machine gun section in the company weapons platoon. The E-series T/O of April 1943 added a third machine gun to the section. In May 1944, the F-series T/O increased the number of machine guns to six and formed them and their crews into a light machine gun platoon commanded by a lieutenant.
The machine gun squad was the basic unit for the light .30 and its crew. A corporal led the squad and had the following non-rated Marines assigned; one gunner, one assistant gunner and ammunition bearers. The D- and E-series T/O specified three ammunition bearers, but this number was increased to five under the F-series T/O.
During all campaigns in which it served, the light .30 proved to be dependable and flexible. Marines appreciated its ease of operation and hard-hitting firepower. Still, it had a few drawbacks. For instance, due to its air cooling and lightweight tripod, the light .30 couldn't keep up the sustained fire of its big brother, the M1917A1. Nevertheless, it was an important part of the Marine's arsenal.
Tables of Organization D, E, F, USMC
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