Senior Airman Jacob Lurvey removes a repeater control card from a radio frequency trunking repeater on Joint Base Charleston during a recent repair Feb. 23. The repeater control card is just one of many electronic components necessary for radio communication with base agencies through the trunking repeater, which allows multiple radio frequency users to communicate on a minimum number of frequencies. Airman Lurvey is a radio frequency system transmission technician with the 628th Communications Squadron. (U.S. Air Force photo/Senior Airman Katie Gieratz)