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In this photo released by the South Korean Navy, the U.S. nuclear-powered aircraft carrier the USS George Washington, largest, leads a group of South Korean and U.S. warships in formation during joint military drills in South Korea's East Sea on Monday, July 26, 2010. U.S. and South Korean warships and helicopters practiced anti-submarine maneuvers off the Korean Peninsula Monday that officers said they hope would serve as a warning to Pyongyang that aggression in the region would not be tolerated.(AP Photo/South Korean Navy)

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