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Royal Australian Navy, Republic of Korea Navy, Japan Maritime Self-Defense Force, and United States Navy warships sail in formation during the Pacific Vanguard 2020 exercise.

Royal Australian Navy, Republic of Korea Navy, Japan Maritime Self-Defense Force, and United States Navy warships sail in formation during the Pacific Vanguard 2020 exercise. (Photo: Japan Maritime Self-Defense Force via U.S. Indo-Pacific Command/ Flickr)