U.S. Air Force Staff Sgt. Ryan Santiago, 39th Security Forces Squadron unit training instructor, prepares to begin an obstacle course in preparation for the 2018 Defender’s Challenge at Incirlik Air Base, Turkey, July 30, 2018. Incirlik AB does not have an actual obstacle course, so members of the 39th SFS created one using to challenge the competitors in the same manor. (U.S. Air Force photo by Staff Sgt. Kimberly Nagle)
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