The doctrine discussed in this manual is nested with ADP 3-0, Operations, and describes the sustainment warfighting function. The endurance of Army forces is primarily a function of their sustainment and is essential to retaining and exploiting the initiative. Sustainment provides the support necessary to maintain operations until mission accomplishment. The relationship between sustainment and operation is depicted in introductory figure-1 on page vi.Sustainment must be integrated and synchronized with operations at every level to include those of our joint and multinational partners. Sustainment depends on joint and strategic links for strategic airlift, sealift, intratheater airlift, and strategic and theater-level supply support. Sustainment depends on our host nation (HN) partners to provide infrastructure and logistics support necessary to ensure both maneuver forces and followon sustainment are delivered to right place, at the right time, and in an operable condition.

ADP 3-0, Operations, constitutes the Army's view of how to conduct prompt and sustained operations across multiple domains, and it sets the foundation for developing other principles, tactics, techniques, and procedures detailed in subordinate doctrine publications. It articulates the Army's operational doctrine for unified land operations. ADP 3-0 accounts for the uncertainty of operations and recognizes that a military operation is a human undertaking. Additionally, this publication is the foundation for training and Army education system curricula related to unified land operations. The principal audience for ADP 3-0 is all members of the profession of arms. Commanders and staffs of Army headquarters serving as joint task force (JTF) or multinational headquarters should also refer to applicable joint or multinational doctrine concerning the range of military operations and joint or multinational forces. Trainers and educators throughout the Army will use this publication as well.

Army Doctrine Reference Publication (ADRP) 4-0, "Sustainment," is the Army's doctrine for sustainment in support of operations. The doctrine discussed in this manual is nested with ADRP 3-0, "Unified Land Operations," and describes the sustainment warfighting function. The endurance of Army forces is primarily a function of their sustainment. Sustainment determines the depth and duration of Army operations. It is essential to retaining and exploiting the initiative. Sustainment provides the support necessary to maintain operations until mission accomplishment. Sustainment is crucial to the success of operations. It must be planned and synchronized with the operation at every level. It is dependent upon joint and strategic links and must be meticulously coordinated to ensure resources are delivered to the lowest level of need. Therefore, sustainment is inherently joint. The combatant commander (CCDR) is able to maximize the effect of combat power through joint interdependence. The Army's capabilities enable joint interdependence into a theater of operations. The Army's robust sustainment capability assists in providing crucial theater and port opening functions enabling joint forces to conduct strategic and operational reach. Once the theater is set, Army sustainment capabilities continue to provide the bulk of Army support to other services (ASOS), common user logistics (CUL), and other common sustainment resources. This enables joint forces with freedom of action and endurance. Through mission command, sustainment commanders instill confidence and disciplined initiative in subordinate commanders which enable them to be bold in taking decisive action.

This publication, Field Manual FM 4-0 Sustainment Operations July 2019, describes how Army sustainment forces, as part of a joint team, provide support to Army and other forces with particular emphasis on support to large-scale combat operations. The principal audiences for FM 4-0 are all Army Soldiers and civilians who provide sustainment support as well as those members of the Army profession who depend on and receive that support. Sustainment commanders and staffs of Army headquarters should also refer to applicable joint or multinational doctrine concerning support to joint or multinational forces. Trainers and educators throughout the Army will also use this publication as the foundation for training and education.FM 4-0 applies to the Active Army, Army National Guard/Army National Guard of the United States and United States Army Reserve unless otherwise stated.

The U.S. military does not believe its soldiers, sailors, airmen, and marines should be engaged in combat with adversaries on a "level playing field." Our combat individuals enter engagements to win. To that end, the United States has used its technical prowess and industrial capability to develop decisive weapons that overmatch those of potential enemies. In its current engagement-what has been identified as an "era of persistent conflict"- the nation's most important weapon is the dismounted soldier operating in small units. Today's soldier must be prepared to contend with both regular and irregular adversaries. Results in Iraq and Afghanistan show that, while the U.S. soldier is a formidable fighter, the contemporary suite of equipment and support does not afford the same high degree of overmatch capability exhibited by large weapons platforms-yet it is the soldier who ultimately will play the decisive role in restoring stability. Making the Soldier Decisive on Future Battlefields establishes the technical requirements for overmatch capability for dismounted soldiers operating individually or in small units. It prescribes technological and organizational capabilities needed to make the dismounted soldier a decisive weapon in a changing, uncertain, and complex future environment and provides the Army with 15 recommendations on how to focus its efforts to enable the soldier and tactical small unit (TSU) to achieve overmatch.

Army unified land operations doctrine expands the discussion of overarching guidance on the Army's core competencies of combined arms manuever and wide area security

Army Doctrine Publication (ADP) 6-0 presents the Army's guidance on command, control, and the mission command warfighting function. This publication concisely describes how commanders, supported by their staffs, combine the art of command and the science of control to understand situations, make decisions, direct action, and accomplish missions. The principal audience for ADP 6-0 is all professionals within the Army. Commanders and staffs of Army headquarters serving as joint task force or multinational headquarters should also refer to applicable joint or multinational doctrine on command and control of joint or multinational forces. Trainers and educators throughout the Army will also use this publication. Commanders, staffs, and subordinates ensure their decisions and actions comply with applicable U.S., international, and, in some cases, host-nation laws and regulations. Commanders at all levels ensure their Soldiers operate in accordance with the law of war and the rules of engagement. ADP 6-0 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated.

This book describes how future Army forces, as part of joint, interorganizational, and multinational efforts, operate to accomplish campaign objectives and protect U.S. national interests. It describes the Army's contribution to globally integrated operations, and addresses the need for Army forces to provide foundational capabilities for the Joint Force and to project power onto land and from land across the air, maritime, space, and cyberspace domains. The Army Operating Concept guides future force development through the identification of first order capabilities that the Army must possess to accomplish missions in support of policy goals and objectives.