The US Navy says American, British and Bahraini ships are carrying out a five-day exercise to improve security in the Persian Gulf and better protect coalition ships against vessels "deemed threatening." The Navy statement released Wednesday by Bahrain headquarters of the 5th Fleet says the exercise is dubbed "Goalkeeper." It started Sunday and is led by Britain's Royal Navy Commodore Peter Hudson. Hudson is quoted as saying the maneuvers will help fine-tune skills such as "locating and tracking" vessels that threaten ships patrolling the Gulf and "handling command and control" operations during a potential confrontation. Gulf waters and the narrow Strait of Hormuz have seen close encounters between US and Iranian vessels.