When may an amateur radio operator transmit unidentified communications?

Amateur radio regulations strictly require station identification for almost all transmissions to ensure accountability and to help resolve any interference issues. However, there is a specific exemption in the rules for the telecommand of model craft, such as remote-controlled planes, boats, or drones, operating on amateur frequencies. In these specific control-link scenarios, transmitting a call sign continuously or at set intervals would be technically impractical and unnecessary for the low-power signals used. Therefore, controlling a model craft is the only time an amateur operator may legally transmit without station identification. Other options, such as brief tests or non-interfering signals, are incorrect because any standard RF emission from an amateur station—no matter how short—must be properly identified.