Field Manual FM 3-94 Theater Army, Corps, and Division Operations April 2014 provides Army doctrine for the theater army, corps, and division. FM 3-94 explains the organization of the theater army, corps, and division headquarters and their respective command posts. It establishes the roles for each headquarters, including their respective contributions to joint operations. It discusses subordinate units and each headquarters' organization of its units, establishment of command and support relationships, and conduct of operations. The principal audience for FM 3-94 is theater army, corps, and division commanders and staffs. It also provides relevant information regarding the organization and operations for commanders and staffs at field army, subordinate theater-level commands and brigades, geographic combatant commands, and other Service headquarters. FM 3-94 uses joint terms where applicable. Selected joint and Army terms and definitions appear in both the glossary and the text. The term for which FM 3-94 is proponent is marked with an asterisk in the glossary. Its definition is boldfaced in the text. For other terms and definitions shown in the text, the term is italicized and the number of the proponent publication follows the definition. FM 3-94 applies to the Active Army, Army National Guard/Army National Guard of the United States, and United States Army Reserve unless otherwise stated. FM 3-94 has seven chapters organized under three parts. Part One describes the Army hierarchy within a geographic combatant command and goes into detail about the theater army, the senior echelon in each geographic combatant command. It includes three chapters. Chapter 1 provides an overview of the higher echelons of the Army. It introduces the three senior echelons of the Army within a geographic combatant command. It describes their roles and tasks in general terms. It lays out the Army concept of sustainment and support provided by theater army. This chapter also discusses operational and administrative chains of command and their differences. The chapter concludes with a brief review of operational areas. Chapter 2 describes the roles and tasks of the theater army. It discusses the staff organization of the theater army. It also discusses the main command post and contingency command post of the theater army and their employment by the theater army commander. Chapter 3 summarizes the theater-level commands and supporting organizations that allow the theater army to fulfill its roles and enable the corps and division to accomplish theirs. Part Two discusses the corps and includes two chapters. Chapter 4 explains the roles and tasks of the corps, together with its operational and administrative responsibilities. The chapter summarizes the subordinate units typically found in the corps echelon. The chapter then discusses the internal organization of the corps and the various command posts available to the corps commander. Chapter 5 examines corps-level operations. This includes how the corps arranges its combat power, organizes the area of operations, and conducts decisive action. Part Three addresses the division in two chapters. Chapter 6 explains the roles and tasks of the division headquarters, together with its operational and administrative responsibilities. The chapter summarizes the subordinate units normally under the operational or tactical control of the division. The chapter then discusses the internal organization of the division headquarters and the various command posts available to the division commander. Chapter 7 examines division-level operations. This includes how the division arranges its combat power, organizes the area of operations, and conducts decisive action.