180719-N-VR594-1076 PACIFIC OCEAN (July 19, 2018) Royal Australian Navy Chief Petty Officer Marine Technician Daniel Davidson, from Sydney, collects a fuel sample while the landing helicopter dock ship HMAS Adelaide (L01) conducts a replenishment-at-sea during the Rim of the Pacific (RIMPAC) exercise, July 19, 2018. Twenty-five nations, 46 ships, five 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 worldÕs largest international maritime exercise, RIMPAC provides a unique training opportunity while fostering and sustaining cooperative relationships among participants critical to ensuring the safety of sea lanes and security of the worldÕs oceans. RIMPAC 2018 is the 26th exercise in the series that began in 1971. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kelsey J. Hockenberger/Released)