The exact regulation from the FCC:
97.119 Station identification.
(a) Each amateur station, except a space station or telecommand station, must transmit its assigned call sign on its transmitting channel at the end of each communication, and at least every 10 minutes during a communication, ........
Hence, when using tactical calls, always end your communication with your call sign. When running control, always give your call sign every 10 minutes.