U.S. sailors stand at attention as the aircraft carrier USS Nimitz (CVN 68) passes the USS Arizona Memorial and the Battleship Missouri Memorial in Pearl Harbor, Hawaii, July 2, 2012, during Rim of the Pacific (RIMPAC) 2012. RIMPAC is a U.S. Pacific Command-hosted biennial multinational maritime exercise designed to foster and sustain international cooperation and security on the world?s oceans. (U.S. Navy photo by Mass Communication Specialist 2nd Class Robert Winn)