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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.
The CH-47 Chinook is arguably the most successful military transport helicopter to date. The Chinook is manufactured by Boeing Rotorcraft Systems at their Ridley Park plant in Pennsylvania. First test flights took place in September 1961 and production started the following year.