The US Navy's USS George Washington aircraft carrier sails in the Pacific near Minamidaito Island in Okinawa Prefecture, southern Japan, December 9, 2010, during a joint drill with the Japanese Self-Defense Forces.[Photo/Agencies]

The helicopter carrier Hyuga of the Japanese Maritime Self-Defense Force sails in the Pacific near Minamidaito Island in Okinawa Prefecture, southern Japan, December 9, 2010, during a joint drill with the US military.[Photo/Agencies]