sentences:  Designed in the early 1970s by General Dynamics, and currently produced by Raytheon, the Phalanx CIWS mount utilizes a 20 mm M61 Vulcan Gatling-style cannon to destroy enemy missiles and aircraft that manage to escape surface-to-air missiles fired from friendly ships.The Phalanx guns work by using a search radar and a tracking radar to follow targets that approach within 1 to of the vessel.When a target is within this range the CIWS mount moves to track the target while simultaneously evaluating the target against several preset criteria to determine the next course of action.