U.S. Air Force Senior Airman Jomalier Viera-Martinez, 39th Security Forces Squadron response force leader, prepares to begin an obstacle course in preparation for the 2018 Defender’s Challenge at Incirlik Air Base, Turkey, July 30, 2018. The obstacle course consisted of several physical challenges ending in running three laps around the track as fast as they can. (U.S. Air Force photo by Staff Sgt. Kimberly Nagle)