A Colombian Air Force crew chief finishes his preflight check list with the pilot before the night exercise during Red Flag 12-4 July 24, 2012, on Nellis Air Force Base, Nev. Aircraft and service members deploy here for Red Flag under the Air Expeditionary Force concept and make up the exercise's "Blue" forces. By working together, these Blue forces are able to utilize the diverse capabilities of their aircraft to engage enemy "Red" forces. (U.S. Air Force photo by Airman 1st Class Daniel Hughes)
United States Air Force
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