M1921 medium tank

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Medium tank M1921
Medium tank M1921 at the Aberdeen Proving Grounds
Type	Light tank
Place of origin	United States
Service history
In service	1921–1926
Used by	US
Production history
Designer	United States Army Ordnance Department
Designed	1921
Manufacturer	Rock Island Arsenal
No. built	1
Specifications
Mass	23 short tons (21 t)
Armor	1 in (25 mm)
Main armament	57mm gun
Secondary armament	two machine guns
Engine	Liberty L-12 engine Gasoline. 338 hp (252 kW)
Power/weight	12 kW/t (16 hp/t)
Maximum speed	T1: 15 km/h (9.3 mph)

The medium tank M1921 was a medium tank built in the United States in the inter-war period. In design, it was similar to earlier World War I era tanks. United States Army engineers worked on the design of the tank, with some influence from British designs of the period, and from the earlier war experience. One example was produced. The tank was an early example of a turreted US tank, less usual at the time, with the turret housing the main gun, with the tank also possessing two machine guns for defense.^[1]