What is a requirement for marking NATO information?

Marking NATO information requires a specific statement that indicates the classification and handling instructions for that information. This statement ensures that personnel can recognize the sensitivity of the information and the obligations tied to its classification. The presence of this required statement is crucial because it guides individuals in protecting NATO information appropriately, ensuring compliance with security protocols and maintaining the integrity of classified data within NATO's framework.

In the context of marking practices, simply omitting classification levels or limiting markings to only the highest classification would not provide sufficient guidance on how to handle information across various contexts. Additionally, utilizing only one marking method is inadequate for communicating the full extent of the information's security requirements. Therefore, having a required statement is essential for clear communication and effective security management of NATO classified information.