Two Singapore Air Force pilots head to their aircraft as U.S. Air Force Maj. Sheldon Gardener, an F-15 Eagle aircraft pilot with the Louisiana Air National Guard, taxis at Korat Royal Thai Air Force Base, Thailand, March 11, 2014, during exercise Cope Tiger 14. Cope Tiger is an annual multilateral aerial exercise designed to improve readiness and cooperation between U.S., Thai and Singaporean forces.