What brevity term would you use to begin using briefed communication procedures to counter communications jamming?

The term "Chattermark" is designated to initiate the use of pre-established communication procedures in response to communications jamming. This brevity term is specifically utilized by military personnel to signify that they are entering a scenario where standard communication channels may be compromised or disrupted due to enemy jamming efforts. By using "Chattermark," personnel signal that they will now employ alternative methods or briefed procedures to maintain effective communication despite the interference.

In contrast, some of the other terms listed serve different purposes. "Echo" typically refers to a request for a repeat of a transmission to ensure clarity, while "Callback" indicates a request for a response to a previous communication. The term "Clear" is often used when confirming that a message has been received without jamming interference. Each of these terms has its own specific use case and does not directly relate to initiating briefed communication in a jamming situation like "Chattermark" does.