Crewmembers aboard a 45-foot Response Boat-Medium from Coast Guard Station Apra Harbor and a Navy patrol boat establish the perimeter of a safety zone in outer Apra Harbor, Guam, May 18, 2017. A temporary safety zone was established to ensure the safety of public and exercise participants during a Navy underwater detonation exercise. (U.S. Coast Guard photo by Petty Officer 2nd Class Melissa E. McKenzie/Released)
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