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U.S. Marine Corps aviation maintenance personnel with Marine All Weather Fighter Attack Squadron 242, inspect an F/A-18D Hornet during Exercise Valiant Shield 16 at Andersen Air Force Base, Guam, Sept. 14, 2016. The inspection ensured there were no malfunctions with the aircraft while inflight. Valiant Shield is a biennial, U.S. Air Force, Navy, and Marine Corps exercise held in Guam, focusing on real-world proficiency in sustaining joint forces at sea, in the air, on land and in cyberspace.