FM 3-94 governs the organization, roles, command relationships, and operations of theater armies, field armies, corps, and divisions.
View FM 3-94 on armypubs.army.mil
It covers landpower, levels of warfare, operational art, combat power, and Army operations in competition and conflict. It establishes headquarters roles, subordinate formations, command and support relationships, and conduct of operations, while requiring compliance with applicable laws and regulations.
Applies to: 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 provides Army doctrine for the theater army, field army, corps, and division.
An Army division can perform one of four roles, although its primary role is that of a tactical headquarters during operations on land. (paragraph 5-3)
The division is organized, trained, and equipped to command between two and five BCTs in combat as well as support the BCTs with a mix of functional and multifunctional brigades and other enablers. (paragraph 5-5)
During armed conflict, the field army, as the ARFOR, may also serve as the joint force land component. (paragraph 3-141)
The theater army is a formation consisting of a headquarters and assigned theater-level enabling forces. (paragraph 3-7)