Portal:United States Navy/Equipment/1

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A Close-in weapon system (CIWS) is a naval shipboard weapon system for detecting and destroying incoming anti-ship missiles and enemy aircraft at short range (the threat(s) having penetrated the ship's available outer defences). Typically, the acronym is pronounced "Sea-whiz".

A CIWS usually consists of a combination of radars, computers, and multiple rapid-fire medium-calibre guns placed on a rotating gun mount. One of the better-known CIWS products in operation is the Raytheon's Phalanx system.