What is TACTICAL DESIGNATOR? What does TACTICAL DESIGNATOR mean? TACTICAL DESIGNATOR meaning - TACTICAL DESIGNATOR definition - TACTICAL DESIGNATOR explanation.<br /><br />Police units in the United States tend to use a tactical designator (or tactical callsign) consisting of a letter of the police radio alphabet followed by one or two numbers. <br /><br />Police and fire department radio systems are assigned official callsigns, however. The official headquarters callsigns are usually announced at least hourly, and more frequently by Morse code.<br /><br />The United States Army uses tactical designators that change daily. They normally consist of letter-number-letter prefixes identifying a unit, followed by a number-number suffix identifying the role of the person using the callsign.