M2 Light tank

English: The Light Tank, M2 was an American light tank developed in the mid-1930s. Early versions lacked a large gun and only carried machine guns; these never saw combat.

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  The M2A1, the first M2 version, introduced in 1935. Unlike its immediate successors, the M2A1 had a single turret.
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  The twin-turreted M2A2, also introduced in 1935.
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  An M2A2 on display at the Mississippi Armed Forces Museum at Camp Shelby, Mississippi.
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  Side view of the Mississippi Armed Forces Museum's M2A2.

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  The M2A3 of 1938, the longer-wheelbase successor to the M2A2.
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  An M2A3 in the 6 April 1939 Army Day parade in Washington, D.C.
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  An M2A3 on display at the General George Patton Museum in Fort Knox, Kentucky.
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  Rear view of the Patton Museum's M2A3.

English: The M2A4, the final M2 version, was the only one to carry a large-caliber gun and the only one to see combat in World War Two. It led directly to the very similar M3 Stuart light tank.

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  The M2A4 of 1940, which returned to a single-turret layout but now carried a 37 mm gun.
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  A Lend-Lease M2A4 being assembled at an English ordnance depot circa 1941.
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  An M2A4 in the United Kingdom on 11 March 1942.
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  M2A4s having their guns cleaned by trainees at Fort Knox in June 1942.
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  A Marine Corps M2A4 is hoisted into a landing craft off Guadalcanal on the first day of landings, 7 August 1942.
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  An M2A4 leads a tank column on Guadalcanal in the Solomon Islands circa 1943.