A U.S. Coast Guard rigid-hull inflatable boat, foreground, role-plays as an aggressive opposing force vessel as the guided missile destroyer USS Bulkeley (DDG 84) provides security for transiting cargo ships Oct. 29, 2013, in the Persian Gulf during exercise Lucky Mariner 14-1. Lucky Mariner is an annual U.S. Navy, coalition and commercial shipping exercise in the U.S. 5th Fleet area of responsibility designed to integrate civil-military responses to global shipping threats.