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File photo: The guided-missile destroyers USS Sterett (DDG 104), front, and USS Dewey (DDG 105) maneuver into formation during the conclusion of Valiant Shield 2014. Valiant Shield is a U.S.-only exercise integrating U.S. Navy, Air Force, Army, and Marine Corps assets, offering real-world joint operational experience to develop capabilities that provide a full range of options to defend U.S. interests and those of its allies and partners.