United States
After World War I, and still using British and French designs, the United States Tank Corps was reduced in size. Renaults and the new Mk VIII "Liberty Tank" were retained: http://www.ftmeade.army.mil/Museum/Exhibit_MarkVIII_Tank.html The Defense Act of 1920 restricted tanks to infantry use only; as a result, the Tank Corps was disbanded, with the remaining tanks distributed among the infantry.
In 1928, at the request of Secretary of War Dwight F. Davis, the Army formed the Experimental Mechanized Brigade. It consisted of a heavy tank battalion, a light tank battalion, a motorised infantry battalion, a motorised artillery battalion, an engineer company, and a signals company. Due to the use of obsolete equipment, the experiment failed, and the force was disbanded after three months.
In 1934–35, at the request of the Cavalry, three prototype tanks, the T2, T2E1, and T2E2 were produced. Under the terms of the Defense Act of 1920, tanks were restricted to infantry units. To get around the Defense Act, these tanks were called "combat cars".The M1 series entered service in 1937. The T2, inspired by the British Vickers 6-Ton, was standardised as the M1 combat car. The T2E1, a single-turret tank armed with three machine guns, was standardised as the M2A1. The T2E2, a two-turret tank with two machine guns, was standardised as the M2A2.
Throughout the interwar period the US produced only a few hundred tanks. From the end of World War I to 1935, only 15 tanks were produced. Most were derivatives or foreign designs or very poor quality private designs. The Christie designs were among the few bright spots, but the US Army acquired only three Christies and did not pursue the idea any further. Budget limitations and the low priority given to the Army meant that there were few resources for building tanks. The US Army instead developed and tested tank components such as suspensions, tracks, and transmissions. This work paid off when production needed to be initiated upon the outbreak of war.
Immediately before and during World War II, U.S tanks and many other Allied tanks were powered by radial aircraft-type engines. However, the massive production of aircraft caused a shortage of these engines. Because of this, many tanks, particularly the Sherman and the Lee, were powered by as many as five different power-plant arrangements. In addition to Wright and Continental radials, they were powered by Ford V8s, GM truck diesels, and the Chrysler A57 multibank (an arrangement of five 6-cylinder automobile engines that ran as a single unit). After the war, diesel truck-type engines replaced the gasoline-burning radials.
Read more about this topic: Tanks Of The Interwar Period
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