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The Security Drone was a unit of the Robotech Masters. Among the many drone mecha that were encountered by the United Earth Forces this one was rarely, if ever seen. Used mainly aboard the massive city-ships for internal sensor sweeps, the Security Drone alerted the Masters to any attempts at invading their domains. It could detect heat, light, motion and sound. It had radio and video-link capacity.
After the end of the Second Robotech War this mecha could still be found among demobilized Robotech Masters' forces. There were recorded cases of their use in the few pitched battles fought between the Invid and Masters' forces.
- It was seen in Episode 29: The Robotech Masters in Robotech: The Masters.