The M13 Multiple Gun Motor Carriage (MGMC), otherwise known as the M13 half-track, was a self-propelled anti-aircraft gun used by the U.S. Army during World War II that was armed with two .50 caliber M2HB heavy-barrel Browning machine guns. Developed in response to a requirement for a mobile anti-aircraft (AA) vehicle, the vehicle was produced by the White Motor Company between July 1942 and May 1943. The only time it was ever used in combat was when the Americans landed at Anzio in January 1944. It was replaced by the more heavily armed M16 Multiple Gun Motor Carriage in April 1944.

The White Motor Company was an American automobile, truck, bus and agricultural tractor manufacturer from 1900 until 1980. The company also produced bicycles, roller skates, automatic lathes, and sewing machines. Before World War II, the company was based in Cleveland, Ohio. White Diesel Engine Division in Springfield, Ohio, manufactured diesel engine generators, which powered U.S. military equipment and infrastructure, namely Army Nike and Air Force Bomarc launch complexes, and other guided missile installations and proving grounds, sections of SAGE and DEW Line stations, radars, Combat Direction Centers and other ground facilities of the U.S. aerospace defense ring, such as the Texas Towers.