What does JANAP 128 provide detailed information on?

JANAP 128, which stands for Joint Army/Navy/Air Force Publication 128, specifically focuses on message formats and precedence within military communications. This publication outlines the standards for transmitting messages between various branches of the U.S. military, including the agreed formats that must be adhered to for clear and efficient communication. Understanding these formats is crucial for ensuring that messages are interpreted correctly and that they maintain an appropriate order of priority based on the established precedence system. High precedence messages may need to be sent and acted upon more quickly than those with lower precedence, and this publication lays out how those priorities should be communicated through standardized formats.