In this Wednesday, April 10, 2013 photo, U.S. Air Force F-16 fighter jets prepare to take off from a runway during their military exercise at the Osan U.S. Air Base in Osan, South Korea. The names of U.S.-South Korean war games staged over the years don't sound all that threatening: Team Spirit, Ulchi Focus Lens, Key Resolve ... Foal Eagle. But whatever they're called, the annual show of force is guaranteed to get a rise out of Pyongyang.  (AP Photo/Ahn Young-joon)
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