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.

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.

SMFLS5:The Sustainment & Multifunctional Logistics SMARTbook (Guide to Operational & Tactical Level Sustainment) has been completely updated for 2021. At 368 pages, SMFLS5 topics and references include the sustainment warfighting function (ADP 4-0); sustainment operations (FM 4-0), sustainment execution (logistics, financial management, personnel services, & health services support); sustainment planning; brigade support (ATP 4-90, Brigade Support Bn); division, corps & field army sustainment (ATP 4-93, Sustainment Brigade); theater support (ATP 4-94, Theater Support Command); joint logistics (JP 4-0); and deployment & redeployment (ATP/JP 3-35), and more than a dozen new/updated Army sustainment references.

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This publication, Field Manual FM 1-0 Human Resources Support April 2014, provides the fundamentals, principles, and concepts of Army human resources (HR) support doctrine. It provides the doctrinal bases for developing operational plans (OPLANS) and standard operating procedures (SOPs) that support national objectives that reinforce the Army's vision that Soldiers and readiness are the principle focus of HR support. This publication applies to the range of military operations and supports Army doctrine publication (ADP) 3-0, Unified Land Operations and ADP 4-0, Sustainment.