Tech. Sgt. Krystoffer Miller, 2nd Security Forces Squadron NCO in charge, and Staff Sgt. Katlyn Porter, 509th SFS evaluator, clear a hurdle during an obstacle course Aug. 28, 2018, at Fort Harrison, Mont. These Airmen will be competing with other major command teams during the 2018 Air Force Defender Challenge. (U.S. Air Force photo by Airman 1st Class Tristan Truesdell)