19th OSS airfield systems technicians climb radio tower
U.S. Air Force Airman 1st Class Zachary Long and U.S. Air Force Senior Airman Ricardo Criado-Marrero, 19th Operations Support Squadron airfield systems technicians, use an oscilloscope to observe different waveforms in the Tactical Air Navigation, or TACAN, monitor Sept. 19, 2016, at Little Rock Air Force Base, Ark. Airfield system technicians ensure proper alignment of the circuit cards within the monitor. (U.S. Air Force photo by Airman Kevin Sommer Giron)