U.S. Air Force Airman 1st Class Kyle Guthrie, 7th Component Maintenance Squadron B-1B Lancer avionics back shop technician, inserts a travelling wave tube into a transmitter at Dyess Air Force Base, Texas, Feb. 13, 2019. Without these transmitters working correctly, the aircraft is unable to perform countermeasures utilizing its defensive avionics system. (U.S. Air Force photo by Airman 1st Class Susan Roberts)