A U.S. Air Force B-52 Stratofortress aircraft from the 20th Expeditionary Bomb Squadron leads a formation of two F-16 Fighting Falcon aircraft assigned to the 18th Aggressor Squadron, two Japanese Air Self-Defense Force F-2 attack fighters from the 6th Tactical Fighter Squadron, two U.S. Navy EA-6B Prowler aircraft from Electronic Attack Squadron 136 and a Japanese E-2C Hawkeye aircraft from 601st Squadron on a flight over Guam during exercise Cope North Feb. 15, 2010. The U.S. Air Force and the Japanese Air Self-Defense Force conduct Cope North annually at Andersen Air Force Base, Guam, to increase combat readiness and interoperability, concentrating on coordination and evaluation of air tactics, techniques and procedures. (DoD photo by Staff Sgt. Jacob N. Bailey, U.S. Air Force/Released)