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In this file photo, USS Ronald Reagan (CVN 76) leads a formation of Carrier Strike Group Five ships as U.S. Air Force and U.S. Navy aircraft, led by a B-52 Stratofortress long-range bomber, pass overhead during Valiant Shield 2018. The biennial, U.S. only, field-training exercise focuses on integration of joint training among the U.S. Navy, Air Force and Marine Corps. This is the seventh exercise in the Valiant Shield series that began in 2006.