Phalanx - This is the land based version of the Phalanx (CIWS) gun system built by Raytheon called the Land-Based Phalanx Weapons System or LPWS. It utilizes the Block 1B gun system with self-destruct rounds to destroy incoming mortar and artillery rounds. The Raytheon Phalanx CIWS was originally designed as a shipboard anti-missile defense system for shooting down incoming missiles and aircraft in the early 80s. (less info)