RAPCON
Staff Sgt. Kandace Parker, 56th Operations Support Squadron airfield management operations supervisor, and Airman 1st Class Lawrence Stephens, 56th OSS airfield management operations coordinator, readjust sand bags on a marker on the Luke Air Force Base flightline. The marker, a large yellow “X,” is used to warn pilots of a runway closure. (U.S. Air Force photo/ Airman 1st Class Tracie Forte.)