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U.S. Air Force Capt. Jacob Wilwert, a B-52 Stratofortress pilot assigned to the 20th Expeditionary Bomb Squadron, Barksdale Air Force Base, La., conducts a preflight checklist aboard a B-52 aircraft before a mission in support of Exercise Cope North at Andersen AFB, Guam, Feb. 9, 2010. The United States Air Force and the Japan Air Self-Defense Force conduct Cope North annually to increase combat readiness and interoperability, concentrating on coordination and evaluation of air tactics, techniques and procedures. The ability for both nations to work together increases their preparedness to support real-world contingencies. (U.S. Air Force photo by Staff Sgt. Jacob N. Bailey)
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