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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.
That is why the movie Air Force One is so comical. The movie depicted Air Force One as bullet proof on the inside. During the developement of its predecessor, the E-4 Airborne Command Post(also a B747), they wanted to make the interior walls sound-proof ---not bullet-proof.