In this photo provided by the Navy Visual News Service, U.S. Navy and Republic of Korea ships transit the East Sea Monday, July 26, 2010, in a 13-ship formation led by the Los Angeles-class attack submarine USS Tuscon (SSN 770). The Republic of Korea and the United States are conducting joint exercises in the seas east of the Korean Peninsula from July 25-28, 2010. (AP Photo/Navy Visual News Service, PO 3rd Class Adam K. Thomas)

Photo by: MC3 Adam K. Thomas

In this photo provided by the Navy Visual News Service, U.S. Navy and Republic of Korea ships transit the East Sea Monday, July 26, 2010, in a 13-ship formation led by the Los Angeles-class attack submarine USS Tuscon (SSN 770). The Republic of Korea and the United States are conducting joint exercises in the seas east of the Korean Peninsula from July 25-28, 2010. (AP Photo/Navy Visual News Service, PO 3rd Class Adam K. Thomas)