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 waters off the east coast of the Korean peninsula, July 26, 2010.[Xinhua/Reuters] |