text: Chapter 5
  Division Roles, Functions, and Organizations
  ...the smallest formation that is a complete orchestra of war and the largest in which every
  man can know you.
  Sir William Slim
  The division is the Army’s primary formation for decisive action against threats with
  peer capabilities during large-scale combat operations. This chapter discusses an Army
  division’s roles and functions across the competition continuum and throughout the
  range of military operations. It also discusses the various command and control nodes
  it can create along with a short description of its typical subordinate units.
  DIVISION OVERVIEW
  5-1. The division is the Army’s principal tactical warfighting formation during large-scale combat
  operations. Its primary role is to serve as a tactical headquarters commanding brigades during decisive action.
  A division conducts decisive action in an AO assigned by its higher headquarters— normally a corps. It task-
  organizes its subordinate forces according to the mission variables to accomplish its mission. A division
  typically commands between two and five BCTs, a mix of functional and multifunctional brigades, and a
  variety of smaller enabler units. Winning battles and engagements remains the division’s primary purpose.
  During limited contingencies, it can organize itself to serve in multiple roles.
  5-2. While the division is manned, trained, and equipped as a tactical formation, it can, with significant
  augmentation, transition to a joint or multinational headquarters for operations other than large-scale combat
  operations. When it is the senior Army formation assigned to a joint task force, it may also serve as the
  ARFOR. When the division is uncommitted to a specific operation, it focuses on building and sustaining
  readiness to prevail in large-scale combat.
  DIVISION ROLES AND FUNCTIONS
  5-3. An Army division can perform one of four roles, although its primary role is that of a tactical
  headquarters during operations on land. An Army division may serve in the following roles:
  * Tactical headquarters.
  * ARFOR headquarters.
  * Joint force land component command.
  * JTF headquarters.
  5-4. It is important to note that the ARFOR and joint roles require significant augmentation. While it is
  possible for a division to serve in multiple roles, this should be avoided whenever possible. A division should
  avoid performing a Service and a joint role simultaneously because these roles can overwhelm the
  commander and the staff, even with augmentation. However, if necessary, a division can perform the ARFOR
  and joint force land component command roles in a limited contingency or crisis response operation for a
  limited duration. This requires significant reorganization and retraining of the headquarters to succeed. When
  a division is tasked to form a JTF headquarters, a different headquarters is required to perform the joint force
  land component command or ARFOR responsibilities.