Airmen assigned to the 28th Security Forces Squadron patrol a simulated perimeter during small unit tactics training at Ellsworth Air Force Base, S.D., Sept. 12, 2014 during an Operational Readiness Exercise. OREs are designed to help Airmen hone their skills in preparation of any real world contingencies Airmen may face. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)