ACP 123 deals with which topic?

• A. Common Messaging Strategy and Procedures
• B. Communications Instructions-General
• C. Joint Reporting System
• D. Standard Message Format

Answer: (A)

ACP publications standardize how allied forces communicate, ensuring interoperability and security across units. ACP 123 specifically lays out the Common Messaging Strategy and Procedures, providing the overarching framework for how messages are planned, prepared, transmitted, prioritized, routed, and acknowledged. This makes it the best pick because it covers the full approach to messaging across the force, not just a single format or a specific system. The other options point to narrower elements or different publications—general communications instructions, a separate reporting system, or a distinct message format—none of which capture the broad messaging strategy and procedures that ACP 123 governs.