What is the correct term used to end a radio message?

In military communications, the term "Out" is used to signify the end of a radio message. This is a standardized procedure that serves to communicate to the recipient that the speaker has finished transmitting and is no longer expecting a response. By using "Out," the speaker provides clarity that the communication is complete, which is crucial for maintaining clear and effective communication protocols, especially in operational contexts where miscommunication could lead to adverse outcomes.

Other terms such as "Clear," "Terminate," and "End" do not specifically convey the same conclusive intent in radio etiquette. For example, while "Clear" might indicate that the channel is free for use, it does not clearly indicate that the transmitting party is done speaking. "Terminate" can imply stopping an action but does not fit the standardized radio terminology. "End," similarly, lacks the formal recognition and understanding that "Out" provides in military communications. Therefore, "Out" is the correct term as it adheres to established radio communication standards.