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A U.S. Air Force F-15D Eagle flies above the Mariana Islands in support of exercise Valiant Shield, Sept. 18, 2018. The exercise helps enable real-world proficiency in sustaining joint forces through detecting, locating, tracking and engaging units at sea, in the air, on land, and in cyberspace in response to a range of mission areas. (U.S. Air Force photo by Senior Airman Zachary Bumpus)