CORRECTS TO REMOVE REFERENCE TO BIGGEST-EVER EXERCISE - A U.S. Air Force EA-18G Growler fighter jet prepares to land at the Osan U.S. Air Base in Pyeongtaek, South Korea, Monday, Dec. 4, 2017. Hundreds of aircrafts including two dozen stealth jets began training Monday as the United States and South Korea launched their combined air force exercise. (AP Photo/Ahn Young-joon)

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