How often must you identify with your FCC-assigned call sign when using tactical call signs such as “Race Headquarters”?

Answer: C. At least every 10 minutes during and at the end of a communication

Even when using tactical call signs like 'Race Headquarters', you must give your FCC-assigned call sign at least every 10 minutes during and at the end of a communication (FCC rule 97.119). A tactical call is helpful but does not replace your real call sign.

Tip: Tactical calls are fine, but still ID every 10 minutes.

FCC rule reference: Part 97.119(a)