A U.S. navy personnel takes a rest under the wings of a fighter jet plane on the deck of U.S. nuclear-powered aircraft carrier USS George Washington at the Busan port in Busan, south of Seoul, South Korea, Saturday, July 24, 2010. North Korea warned Saturday that joint U.S. and South Korean military exercises poised to begin this weekend amount to a military provocation that will draw a "powerful" nuclear response from Pyongyang. (AP Photo/Lee Jin-man)

Photo by: Lee Jin-man

A U.S. navy personnel takes a rest under the wings of a fighter jet plane on the deck of U.S. nuclear-powered aircraft carrier USS George Washington at the Busan port in Busan, south of Seoul, South Korea, Saturday, July 24, 2010. North Korea warned Saturday that joint U.S. and South Korean military exercises poised to begin this weekend amount to a military provocation that will draw a "powerful" nuclear response from Pyongyang. (AP Photo/Lee Jin-man)