Today in WW II: 21 May 1942 Sinking of the Mexican tanker Faja de Oro by German submarine U-160, off Key West, precipitates Mexican declaration of war against Nazi Germany.

M-15 Multiple Gun Motor Carriage (GMC)

The M-15 Multiple Gun Motor Carriage (GMC) was a mobile anti-tank and anti-aircraft weapon based on the White M3 Halftrack. The M15 had an armored enclosure on the rear that housed a 37mm M1A2 automatic cannon plus two .50 cal. M2HB machine guns. On the M15 the machine guns were mounted above the 37mm gun, while on the M15A1 the machine guns were below.

The M-15 Multiple Gun Motor Carriage was based on the eariler T28E1 platform, eighty of which were built by Autocar in mid-1942. The T28E1 was armed with the 37mm sutomatic cannon and two .50 cal. water cooled machine guns.

The M-15 was manufactured by Autocar in early 1943 (500 built), then replaced by production of the M15A1 in late 1943 and February 1944 (1652 built). The M15A1 continued in use through the Korean War.

Recommended Book About the M-15 Multiple Gun Motor Carriage

M3 Infantry Half-Track 1940-73

M-15 Multiple Gun Motor Carriage Photos

Find additional photos and hi-res versions of the M-15 Multiple Gun Motor Carriage at the Olive-Drab Military Mashup:

M15A1 Halftrack, and air defense weapon that carried a 37mm automatic gun plus twin heavy barrel Browning M2 .50 cal. machine guns, U.S. Army Air Defense Artillery Museum, Fort Sill, OK. The M15A1 was based on the M3A1 halftrack with the M54 gun mount. The machine guns mounted below the level of the 37mm barrel, different from the M15.

M-15 Multiple Gun Motor Carriage (GMC) antiaircraft halftrack near San Pietro Infine, Italy, winter 1943-44.

M15 Multiple Gun Carriage halftrack, camouflaged, with 37mm gun and revolving turret, awaiting shipment overseas, 27 May 1943. This vehicle accompanied the 45th Division when it sailed from Hampton Roads Port of Embarkation early in June 1943 for service in Africa, Sicily and Italy.

An M-15 Multiple Gun Motor Carriage (GMC) halftrack rolls out of an LST onto Cape Gloucester as the Marines landed the day after Christmas. 1943. The M15 has an armored enclosure on the rear that houses a 37mm M1A2 automatic cannon plus two .50 cal. M2HB machine guns. The LST is loaded with similar vehicles and trucks laden with ammunition and supplies are carried on the deck like the one in the background.

M-15 Multiple Gun Motor Carriage (GMC), top view. The M15 had an armored enclosure on the rear that housed a 37mm M1A2 automatic cannon plus two .50 cal. M2HB machine guns. On the M15 the machine guns were mounted above the 37mm gun, while on the M15A1 the machine guns were below.

443d Coast Artillery (AA) Battalion halftrack deploys outside an airdrome 1n St. Raphael, Southern France in August 1944. The M-15 Multiple Gun Motor Carriage halftrack was based on the prototype T28E1 platform, such as the one seen here. Most of the developmental T28E1s were deployed with the 443d.

M-15 Multiple Gun Motor Carriage Photo Gallery

M-15 Multiple Gun Motor Carriage.

T28E1 Multiple Gun Motor Carriage, 443d Coast Artillery Regiment, Tunisia, 1942-1943.

45th Division M-15 Multiple Gun Motor Carriage (GMC) at Hampton Roads Port of Embarkation, 27 May 1943.