Which radio term is used to acknowledge that a message was received but does not require a response?

The correct term to acknowledge that a message was received but does not require a response is "Copy." In radio communication, when an operator says "Copy," it indicates that they understand the message and have received it clearly. This term is particularly useful in maintaining clear and concise communication, especially in operational contexts where time is critical, and responses may not be necessary.

"Copy" serves to confirm that the message has been acknowledged without the need for further dialogue, allowing the conversation to continue without interruption. This is essential in maintaining operational efficiency during radio communications, as it streamlines the exchange of information.

The other terms have different meanings in radio communication. "Over" is used to indicate that the speaker has finished their transmission and is awaiting a response from the other party. "Out" signifies that the speaker has completed their conversation and does not expect a reply, while "Clear" suggests that a frequency or channel is free for use, typically to ensure that no one else is transmitting on it before a new communication begins. Understanding these distinctions is crucial for effective and accurate radio communication in military operations.