The M134 GAU-17 “Vulcan” cannon is a six-barreled, air cooled, medium machine gun used primarily as a fire suppression weapon in aircraft for the U.S. military. The so-called “Gatling” design relies on electric motors to power the barrels resulting in a firing rate as much as 6,000 rounds per minute. It is used in a variety of rotor wing aircraft in the “door gunner” position and is used by the U.S. Navy for its riverine craft and special operations watercraft.