Two P-3 Orion anti-submarine and maritime surveillance aircraft from the Japan Maritime Defense Force, left, and the U.S. Navy, right, fly over the Los Angeles-class attack submarine USS Houston (SSN 713) underway in the Pacific Ocean during a photo exercise on the final day of Exercise Keen Sword 2011, Dec. 10, 2010.
Keen Sword is a bilateral exercise designed to strengthen military operations between the U.S. and Japan, which remains a key strategic partner in the Northeast Asia Pacific region. (DoD photo by Mass Communication Specialist 3rd Class Adam K. Thomas, U.S. Navy/Released). Original public domain image from Flickr