What document is referred to as the "postal manual" for the Department of Defense?

The document referred to as the "postal manual" for the Department of Defense is Postal Manual 4525.6M. This manual provides detailed guidelines and procedures for postal operations within the military, ensuring that personnel understand the regulations pertaining to mail handling, delivery, and overall postal service operations in a military context.

This manual covers various aspects of military postal service, including the roles and responsibilities of postal personnel, mailing standards, and the operational procedures necessary to maintain effective postal support for service members. It serves as a key reference for managing and executing postal operations, which is crucial in maintaining communication and logistics in military settings.

Other documents listed, while related to military regulations and procedures, do not specifically serve the function of a postal manual as defined by the Department of Defense.