Raytheon Company, Tucson, Ariz., is being awarded a $52,084,929 modification to previously awarded contract (N00024-12-C-5405) for design agent engineering and technical support services for Phalanx, SeaRAM, and Land-based Phalanx Weapon Systems required for maintaineance, reliability, and improvements. PHALANX Close-In Weapon System (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 Program. Operating either autonomously or integrated with a combat system, it is an automatic terminal defense weapon system designed to detect, track, engage, and destroy anti-ship missile threats penetrating outer defense envelopes. The Naval Sea Systems Command, Washington, D.C., is the contracting activity.