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The crew of Los Angeles-class fast attack submarine USS Louisville hosts a group of Royal Thai Navy sailors led by Vice Adm. Chareonpol Koomrasi, Chief of Staff of the RTN Fleet, and Capt. Matt Jerbi, commodore of Destroyer Squadron 7 during Exercise Guardian Sea. Guardian Sea is a U.S. Navy and RTN anti-submarine warfare (ASW) exercise is designed to strengthen interoperability and reinforce procedures for tracking submarines in a variety of conditions.