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M61 Vulcan is a hydraulically or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm rounds at a rate of about 6,000 rounds per minute. The Vulcan entered service in 1959. The M61 and its derivatives have been the principal cannon armament of United States military fixed-wing aircraft for fifty years. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kasey Krall/Released)
Photo by: MC3 Kasey Krall
M61 Vulcan is a hydraulically or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm rounds at a rate of about 6,000 rounds per minute. The Vulcan entered service in 1959. The M61 and its derivatives have been the principal cannon armament of United States military fixed-wing aircraft for fifty years. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kasey Krall/Released)

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