Royal Australian Navy divers, participating in Rim of the Pacific (RIMPAC) 2012, swim under the battleship USS Missouri (BB-63), as part of a familiarization dive with Mobile Diving and Salvage Unit 1 Navy divers, whom are also participating in RIMPAC. Twenty-two nations, more than 40 ships and submarines, more than 200 aircraft and 25,000 personnel are participating in the biennial RIMPAC exercise from June 29 to Aug. 3, in and around the Hawaiian Islands. The world's largest international maritime exercise, RIMPAC provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2012 is the 23rd exercise in the series that began in 1971. (U.S. Navy photo by Mass Communication Specialist 1st Class Anderson C. Bomjardim)