The guided-missile destroyer USS Farragut is shown in this undated photo operating in heavy seas in the Atlantic Ocean. Iranian forces boarded a Marshall Islands-flagged cargo ship in the Gulf on Tuesday after patrol boats fired warning shots across its bow and ordered it deeper into Iranian waters, the Pentagon said. The closest U.S. warship was more than 60 miles away, he said, and the U.S. military instructed destroyer USS Farragut to head towards the cargo ship, which was passing through the Strait of Hormuz at the time. REUTERS/Aaron Chase/U.S. Navy/Handout FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS