What should be the minimum information required in a classified marking?

The minimum information required in a classified marking is the classification level and date of marking. This is essential because the classification level indicates the sensitivity of the information and determines who is authorized to access it. It sets the protocol for handling the document and ensures that personnel are aware of the level of protection required.

Additionally, the date of marking is important for maintaining the currency of the classification status. As information may need to be reevaluated for its relevance or sensitivity over time, having the marking date helps organizations track when a document was classified and when it might be eligible for declassification. This practice is crucial for managing classified information efficiently and in compliance with regulations governing national security.

Including other elements, like a content summary or author name, while potentially useful in specific contexts, does not fulfill the core requirements of classified marking, which prioritize sensitivity and date relevance.