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Multinational navy ships and a submarine steam in formation during a group sail off the coast of Hawaii as part of exercise Rim of the Pacific (RIMPAC) 2020. Ten nations, 22 ships, 1 submarine, and more than 5,300 personnel are participating in Exercise Rim of the Pacific (RIMPAC) from August 17 to 31 at sea in the waters surrounding Hawaii. RIMPAC is a biennial exercise designed to foster and sustain cooperative relationships, critical to ensuring the safety of sea lanes and security in support of a free and open Indo-Pacific region. The exercise is a unique training platform designed to enhance interoperability and