What does joint doctrine primarily guide?

Joint doctrine primarily guides the employment of all US Military Forces by providing a framework for conducting operations that incorporate capabilities from different military branches. This doctrine ensures that the Army, Navy, Air Force, and Marine Corps work together effectively to achieve common objectives in joint operations. It establishes principles and procedures that help coordinate actions across services, enhancing interoperability and overall operational effectiveness in various mission scenarios.

While other options might seem relevant, they do not encompass the comprehensive approach of joint doctrine. For instance, while international relations do play a role in military considerations, joint doctrine specifically focuses on the military aspect of operations rather than political agreements. Similarly, tactical operations of a single branch focus on a more limited scope and do not reflect the joint nature of military operations in a broader context. Lastly, while coordination between governmental agencies is important, joint doctrine's primary concern is the integration and employment of military forces rather than inter-agency collaboration. Thus, the focus on employing all US Military Forces makes option B the most accurate choice regarding the purpose of joint doctrine.