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The Los Angeles-class attack submarine USS Tucson (SSN 770, front) is underway ahead of the U.S. nuclear-powered aircraft carrier USS George Washington (3rd L) and South Korean Navy's Landing Platform Helicopter ship Dokdo (3rd R) during the U.S.-South Korea joint naval and air exercise in the open sea east of South Korea July 26, 2010. (Xinhua/AFP Photo)
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