Ships from the Navy and Japan Maritime Self-Defense Force cruise in the Pacific Ocean at the conclusion of exercise Keen Sword, which took place Dec. 3 through 10, 2010. The exchange brought together more than 40,000 U.S. and Japanese military members and focused on integrated air and missile defense, base security and force protection, search and rescue, and maritime defense and interdiction. More than 400 aircraft participated in the exercise and were operated bilaterally with at least 60 ships and missile defense equipment. (U.S. Navy photo)