This United States Army publication, Field Manual FM 3-94 Armies, Corps, and Division Operations July 2021, provides Army doctrine for the theater army, field army, corps, and division. FM 3-94 explains the organization of the theater army, field army, corps, and division and explains how they conduct operations in support of the Army's strategic roles. 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, field army, corps, and division commanders and staffs. It also provides relevant information regarding the organization and operations for commanders and staffs at subordinate theater-level commands and brigades, geographic combatant commands, other Service headquarters, and interagency partners.