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Adm. Scott H. Swift, outgoing commander of U.S. Pacific Fleet, right, and Adm. John C. Aquilino, incoming commander of U.S. Pacific Fleet, left, salute each other during a change of command ceremony. The world’s largest fleet command, the U.S. Pacific Fleet encompasses 100 million square miles, nearly half the Earth’s surface, from Antarctica to the Arctic circle and from the West Coast of the United States into the Indian Ocean. The U.S. Pacific Fleet consists of approximately 200 ships and submarines, nearly 1,200 aircraft, and more than 130,000 Sailors and civilians.