180718-N-CW570-2131 JOINT BASE PEARL HARBOR-HICKAM, Hawaii (July 18, 2018) Steelworker 1st Class Cody Oswald, assigned to Underwater Construction Team (UCT) 2, conducts underwater navigation training at Joint Base Pearl Harbor-Hickam during Rim of the Pacific (RIMPAC) exercise, July 18, 2018, 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 world’s 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 world’s oceans. RIMPAC 2018 is the 26th exercise in the series that began in 1971. (U.S. Navy photo by Mass Communication Specialist 1st Class Arthurgwain L. Marquez/Released)