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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 design for the Chinook originates from the Vertol Model 107, which was produced by Boeing Vertol in the early 1960s. The Vertol was one of the pioneer twin rotor cargo helicopters developed by Boeing. Chinooks are now used in both military and civilian roles by more than 16 nations.