Royal Australian Navy divers prepare to begin a familiarization dive with U.S. Navy divers assigned to Mobile Diving and Salvage Unit 1 July 10, 2012, at Joint Base Pearl Harbor-Hickam, Hawaii, during Rim of the Pacific 2012. RIMPAC is a U.S. Pacific Command-hosted biennial multinational maritime exercise designed to foster and sustain international cooperation on the security on the world?s oceans. (U.S. Navy photo by Mass Communication Specialist 1st Class Anderson C. Bomjardim/Released)