37 mm Gun M3
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The 37 mm gun M3 is the first dedicated anti-tank gun fielded by United States forces in numbers. Introduced in 1940, it became the standard anti-tank gun of the U.S. infantry with its size enabling it to be pulled by a jeep. Wikipedia
Shell: 37×223 mm. R
Length: 3.92 m (12 ft 10.3 in)
Breech: Vertical sliding-block
Caliber: 37 mm (1.45 inch)
Carriage: Split trail
Crew: 4–6
Elevation: -10° to +15°