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Phalanx CIWS Mark 15. [WW3]

The Phalanx CIWS (pronounced "sea-wiz") is a close-in weapon system for defense against airborne threats such as anti-ship missiles and helicopters. It was designed and manufactured by the General Dynamics Corporation, Pomona Division (now a part of Raytheon). Consisting of a radar-guided 20 mm Vulcan cannon mounted on a swiveling base, the Phalanx has been used by multiple navies around the world, notably the U.S. Navy, which deploys it on every class of surface combat ship except the Zumwalt-class destroyer and San Antonio-class amphibious transport dock, by the Royal Canadian Navy, the British Royal Navy, and by the U.S. Coast Guard aboard its Hamilton- and Legend-class cutters. The Phalanx is used by 15 other allied nations.

A land variant, known as the LPWS (Land Phalanx Weapon System), part of the C-RAM system, has recently been deployed in a short range missile defense role, to counter incoming rockets, artillery and mortar fire. The U.S. Navy also fields the SeaRAM system, which pairs the RIM-116 Rolling Airframe Missile with sensors based on the Phalanx.