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Dubbed the "Flying fortress" because of its offensive firepower, the Boeing B-17 was among the most famous war-era aircraft of its time. Throughout the war, the B-17 was produced in larger quantities than any other previous model. The aircraft was equipped with 13, .50-caliber machine guns and three revolving gun turrets, along with waist and cheek guns. Source 9u
Image from Wikimedia public domain.
B-17 Flying Fortress (Hover)