· John M. Browning developed the M2 heavy machine gun at the end of World War I. After a series of early watercooled, aircraft, and tank models were tested in the 1920s, an improved version was adopted in 1933 as the Browning M2 watercooled machine gun. Subsequent models, using the same receiver, were adopted by the various services. During World War II, nearly two million M2 machine .
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