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In this file photo, a D7 medium-bulldozer assigned to the 561st Engineer Constructions Company, 84th Engineer Battalion, scoops away torn down trees from a road during Rim of the Pacific (RIMPAC) exercise on Marine Corps Training Area Bellows, July 12, 2018. U.S. Navy Seabees with Naval Mobile Construction Battalion One, 22nd Naval Construction Regiment, supported U.S. Army equipment operators assigned to 561st Engineer Constructions Company, 84th Engineer Battalion, with route clearing training based on an environmental disaster scenario such as a tsunami or hurricane. Twenty-five nations, 45 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 on the world's oceans. RIMPAC 2018 is the 26th exercise in the series that began in 1971.