Airman Johnrafael Pena, a 28th Communications Squadron radio frequency technician, repairs a radio at Ellsworth Air Force Base, S.D., Sept. 5, 2018. The radio maintenance shop is responsible for maintaining and repairing many of the land mobile radios. They also maintain the base’s mass communication system and also set up and operate public address equipment for community events. (U.S. Air Force photo by Airman 1st Class Thomas Karol)