Keen Sword 2010: US, Japan hold joint military exercises (12 images)

U.S. Navy and Japan Maritime Self Defense Force vessels sail in formation during the "Keen Sword 2010" U.S.-Japan joint military exercise in the Pacific Ocean east of Okinawa island, Japan, on December 10, 2010. UPI/Keizo Mori

Deck crew members work at the aircraft carrier USS George Washington during the "Keen Sword 2010" U.S.-Japan joint military exercise in the Pacific Ocean east of Okinawa island, Japan, on December 10, 2010. UPI/Keizo Mori

A U.S. Air Force B-52 Stratofortress flies in formation with Japan Air Self-Defense Force F-15J's and U.S. Air Force F-15's during the "Keen Sword 2010" U.S.-Japan joint military exercise in the Pacific Ocean east of Okinawa island, Japan, on December 10, 2010. UPI/Keizo Mori

Deck crew members work at the aircraft carrier USS George Washington during the "Keen Sword 2010" U.S.-Japan joint military exercise in the Pacific Ocean east of Okinawa island, Japan, on December 10, 2010. UPI/Keizo Mori