International Navy ships assemble for a photo exercise off the coast of Hawaii during the Rim of Pacific Exercise (RIMPAC) 2018, on July 26. Twenty-six nations, more than 45 ships and submarines, about 200 aircraft, and 25,000 personnel are participating in RIMPAC from June 27 to Aug. 2 in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC provides a unique training opportunity while fostering and sustaining cooperative relationships between participants critical to ensuring the safety of sea-lanes and security on the world's oceans. RIMPAC 2018 is the 26th exercise in the series that began in 1971.