The T30 howitzer motor carriage (HMC) was a United States Army self-propelled gun used in World War II.

Produced by the White Motor Company, the vehicle was simply a 75 mm Pack Howitzer M1 mounted on a modified M3 Half-track.

It had a range of 150 mi (240 km) and had a speed of 40 mph (64 km/h),[3] and was powered by a White 160AX, 147 hp (110 kW),[2] 386 in3 (6,330 cc), six-cylinder, gasoline engine, with a compression ratio of 6.3:1.

A prototype vehicle was authorized in October 1941 armed with an M1A1 75 mm Pack Howitzer and a mount that was designed to fit on a simple box structure in the back of an M3 Half-track.

[7][8] Authorization for the production of two prototypes was given in January 1942;[9][a] first deliveries of the vehicle were made the following month from the White Motor Company.

After several similar experiences, U.S. forces ceased the practice of employing self-propelled howitzers or mortars in direct combat with tanks.

The T30 was eventually replaced by the M8 HMC, which was based on the M5 Stuart light tank, and which began entering service around the same time as the T30.