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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.
Afghanistan helicopter crash: Why Army has used Chinook for half a century. The rugged CH-47 Chinook helicopter that crashed in Afghanistan flies fast and has double the lift capacity of its Vietnam-era forebears.