PACIFIC OCEAN (Sept. 18, 2021) The Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89) fires 20mm rounds from its Phalanx close-in weapon system (CIWS) at a �killer tomato� naval gunnery target, Sept. 18, 2021. Mustin is currently underway in the U.S. 4th Fleet area of responsibility conducting a series of exercises designed to increase interoperability and build capacity among partner nations. (U.S. Navy photo by Mass Communication Specialist 2nd Class James S. Hong)