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In a dramatic mid-sea operation just miles away from Iran, elite U.S. Marines fast-rope onto a cargo ship to take control of the vessel, but just minutes later, they pull back. So what went wrong? The incident reportedly unfolded in the Arabian Sea, where U.S. forces are enforcing a sweeping blockade on Iran. According to the United States Central Command, Marines from the 31st Marine Expeditionary Unit boarded a commercial vessel the M/V Blue Star III, after it raised suspicions. The concern was that the ship was heading toward an Iranian port in violation of U.S. restrictions, as per CENTCOM. Watch the video for more details.