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A U.S. Navy and Republic of Korea (ROK) navy Sailor watch as the United States and ROK national flags are hoisted on the sail of the Los Angeles-class fast-attack submarine USS Springfield (SSN 761) after it pulled into port in Busan, Feb. 23. Springfield is one of four Los Angeles-class fast-attack submarines forward deployed to the island of Guam and assigned to Commander, Submarine Squadron (CSS) 15. CSS-15 is responsible for providing training, material and personnel readiness support to multiple Los Angeles-class fast-attack submarines and is located at Polaris Point, Naval Base Guam. (U.S. Navy photo by Mass Communication Specialist 2nd Class Adam Craft)