Which AFI provides guidance on Air Force messaging?

AFI 33-119 is the appropriate Air Force Instruction that provides guidance on Air Force messaging. This instruction outlines the policies, procedures, and responsibilities for managing official messaging within the Air Force, which is essential for ensuring secure and efficient communication. Effective messaging policies help ensure that service members can communicate effectively while adhering to security protocols, promoting both operational security and the integrity of the communication systems.

The other options, while they may cover related topics within the realms of cybersecurity, communication, or information technology in the Air Force, do not specifically focus on the guidance for messaging. Their content may pertain to other areas of communication systems or information management, but AFI 33-119 is the definitive source for messaging protocols and frameworks within the Air Force.