This Army Techniques Publication (ATP) describes the organization, mission, and operations of the sustainment brigade and its subordinate units. These subordinate units are task organized to the sustainment brigade depending on the specific mission of the brigade. This manual also describes the relationships of the sustainment brigade and its subordinate units to each other as well as to the organizations they have command and support relationships with. This manual applies to unified land operations extending from stable peace to general war. Doctrine is not intended to cover garrison operation, but should serve as a guide for training and operations in garrison to prepare for war. The principle audience for this publication is Army commanders, geographic combatant commanders (GCCs), joint force commanders (JFCs), and sustainers throughout the Army. This ATP serves as an authoritative reference for students and personnel who: -Develop doctrine materiel (fundamental principles and TTP) and force structure. -Develop institutional and unit training. -Develop standing operating procedures (SOP) for unit operations. 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. (See Field Manual FM] 27- 10.) ATP 4-93 uses joint terms where applicable. Selected joint and Army terms and definitions appear in both the glossary and the text. ATP 4-93 does not introduce any new terms, rescind any terms or modify any terms. ATP 4-93 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated. The proponent of this manual is the Unites States Army Combined Arms Support Command (USACASCOM).