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SOUTH CHINA SEA (July 21, 2015) The Republic of Singapore navy's RSS Intrepid (69), right, RSS Supreme (73), and the Arleigh Burke-class guided-missile destroyer USS Lassen (DDG 82), left, trail the littoral combat ship USS Fort Worth (LCS 3) during the underway phase of Cooperation Afloat Readiness and Training (CARAT) Singapore 2015. CARAT is an annual, bilateral exercise series with the U.S. Navy, U.S. Marine Corps and the armed forces of nine partner nations.