Philippines Navy, Japan Navy, Indian Navy, Australian Navy, Indonesia & US Navy Enters in Pearl Harbor-Hickam, United States Military Base. Twenty-five nations, 46 ships, five submarines, about 200 aircraft, and 25,000 personnel are participating in RIMPAC. 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. This exercise provides tremendous training value, enabling partners to build skills and refine procedures through working together. Part of this comes from seeing how other partners approach similar scenarios, offering new perspectives.