FILE--In this file photo taken on Thursday, April 22, 2010, and released by the semi-official Iranian Fars News Agency, Revolutionary Guard's troops attack and take over a war ship, being used as a target, during a maneuver in the Persian Gulf, Iran. Iran will target American aircraft carriers in the Persian Gulf should a war between the two countries ever break out, the naval chief of Iran's powerful Revolutionary Guard warned Tuesday, May 6, 2014 as the country completes work on a large-scale mock-up of a U.S. carrier. (AP Photo/Fars News Agency, Mehdi Marizad, File)