Raytheon Missile Systems has won a $13.6 million contract modification to exercise options for Mk 15 Close-In Weapon System (CIWS) sensor kits. CIWS is a fast-reaction terminal defense against low- and high-flying, high-speed maneuvering anti-ship missile threats that have penetrated all other defenses. The CIWS is an integral element of the Fleet Defense In-Depth concept and the Ship Self-Defense Programme. CIWS consists of three variants: Phalanx, which utilizes a six barrel Gatling gun; Landbased Phalanx Weapon System (LPWS) and SeaRAM, which replaces the gun with an 11-round Rolling Airframe Missile (RAM) guide. Work is expected to be completed by December 2022.