Senior Master Sgt. Warren Relaford, 28th Operations Support Squadron airfield management manager, performs runway safety checks to gather condition readings on the flightline during an Operational Readiness Exercise on Ellsworth Air Force Base, S.D., Feb. 23, 2012. The runway condition is verified regularly to ensure the safety of aircraft and other vehicles on the runway. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)