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Every person with a GMRS radio needs to identify per the rules' requirements. Tactical identifiers are out of the FCC's scope, and can be used freely as long as all other rules are followed and the callsign is given per FCC rules. If you and someone else under your license are talking to each other, both you and the other party will have to give your callsign for identification. As tactical identifiers aren't regulated, there's no requirement to use one, though they are explicitly permitted to be included in an otherwise compliant identification. See 95.1751.