PACIFIC OCEAN (Sept. 12, 2021) Sailors aboard the Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89) hold the phone and distance line during an underway replenishment, Sept. 12, 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)