What is the primary purpose of Army Doctrine Publication (ADP) 4-0?

The primary purpose of Army Doctrine Publication 4-0 is to provide guidance on sustainment operations, which are critical to the success of military missions. Sustainment encompasses the logistics, personnel services, and health service support necessary to maintain operational effectiveness. By articulating how sustainment integrates with combat operations, ADP 4-0 ensures that Army forces can be effectively supplied, maintained, and supported throughout the execution of their missions.

Sustainment is foundational to maintaining the operational readiness of forces, impacting everything from supply chains and resource allocation to the morale and welfare of troops. This doctrine identifies the principles that govern sustainment operations and is instrumental in guiding leaders and units in planning and executing logistical efforts.

In contrast, the other options focus on different military aspects. Tactical operations deal with the execution of missions on the battlefield, military strategy encompasses the overarching plans that guide military engagements, and education and training programs are geared towards developing the skills of personnel. While these elements are important, they do not specifically address the core purpose of ADP 4-0, which is to ensure effective sustainment practices.