Senior Master Sgt. Charles Barkheimer, 205th Engineering and Installation Squadron quality assurance superintendent, watches as Senior Airman Tyler Nelson, 205th EIS cable antenna systems Airman, installs panels on a rack for radios in the air traffic control tower of the 36th Operations Support Squadron at Andersen Air Force Base in Guam on Sept. 15, 2019. The 205th EIS had seven Airmen working to install ten CM-300/350 radios in the 36th Operations Support Squadron air traffic control tower in Guam as part of the U.S. Air Force Air Traffic Control and Landing Systems Radio Replacement Program. (U.S. Air National Guard photo by Staff Sgt. Brigette Waltermire)