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For the majority of the Vietnam war, the principal weapon of the door gunner was a medium machine gun (MG), initially, a M1919A4 .30 caliber MG, and soon thereafter, the M60 7.62mm MG became the standard helicopter door armament system.
During the Vietnam War, the use of the helicopter, known as Air Mobile, was an essential tool for conducting the war. In fact, the whole conduct and strategy of the war depended on it. Vietnam was the first time the helicopter was used on a major scale, and in such important roles.