Petty Officer 1st Class Peter O'Brien, a boatswain's mate stationed at Coast Guard Station Apra Harbor, interacts with recreational boaters while ensuring a safety zone in outer Apra Harbor during the Navy Ordnance Disposal Mobile Unit FIVE underwater detonation exercise, May 18, 2017. The safety zone was established to ensure the safety of the public and exercise participants. (U.S. Coast Guard photo by Petty Officer 2nd Class Melissa E. McKenzie/Released)
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