The Phalanx Close-In Weapons System (CIWS) was designed to be a last line of defense for anti-ship missiles. It consists of a radar-guided 20 mm Gatling gun mounted on a swivel base and can fire 4,500 rounds/minute (75 rounds/second). The effective firing range is 3.6 km (2.2 mi). The CIWS can also be used to defend against fast-attack boats and surface threats. Filmed aboard the U.S. Coast Guard Cutter Bertholf (WMSL-750).
Film Credits: PO1 Henry Dunphy