U.S. Air Force Staff Sgt. Curtis Betz, left, an F-15C Eagle aircraft crew chief assigned to the 18th Aircraft Maintenance Squadron, talks with a Singaporean airman during an F-15 aircraft maintenance exchange as part of Cope Tiger 13 at Korat Royal Thai Air Force Base, Thailand, March 12, 2013. Cope Tiger is an annual multilateral aerial exercise designed to improve readiness and cooperation between U.S., Thai and Singaporean forces. (U.S. Air Force photo by 2nd Lt. Jake Bailey/Released)