text: Chapter 4
  4-4. The nature of an operation will dictate how many roles a corps can perform simultaneously. The
  workload associated with performing two roles during large-scale combat operations can overwhelm a corps
  commander and staff. Generally, a corps serving as a JTF headquarters should not perform as a tactical
  formation, ARFOR, or JFLCC. There should be a separate ARFOR because of the differing responsibilities.
  JTFs focus on the operational level of war and use joint rather than Army doctrine. A corps headquarters can
  simultaneously provide the nucleus of a land component commander and ARFOR headquarters during major
  operations if another headquarters acts as the corps commander’s lead agent for the conduct of ADCON
  tasks.
  TACTICAL FORMATION
  4-5. Large-scale combat operations require a corps headquarters to function as a tactical formation under a
  land component command or subordinate to a field army equivalent established under an alliance or coalition.
  The corps commander synchronizes the employment of joint capabilities in conjunction with Army decisive
  action. Corps operations shape an OE and set the conditions for tactical actions by the division and lower
  echelons. In large-scale combat operations, the corps task-organizes and maneuvers divisions to destroy
  enemy land forces, seize key terrain and critical infrastructure, and dominate the land portion of the JOA.
  4-6. Corps conduct continuous and simultaneous offensive, defensive, and stability operations or defense
  support of civil authority tasks through a series of synchronized division and separate brigade operations.
  These operations achieve and exploit positions of relative advantage across multiple domains to destroy or
  defeat an enemy and achieve the operation’s overall purpose.
  4-7. The six primary functions of a corps are—
  * Conduct shaping operations in the corps AO.
  * Task-organize and employ divisions and brigades.
  * Integrate and synchronize operations of divisions and brigades.
  * Mass effects at decisive points.
  * Allocate resources and set priorities.
  * Leverage joint capabilities.
  4-8. Large-scale combat operations require the corps to shape operations ahead of their subordinate
  divisions by disintegrating enemy systems, such as the enemy’s integrated fires command, to facilitate current
  and future operations. The corps task-organizes divisions and its functional and multifunctional brigades with
  the necessary capability and capacity to achieve objectives and to weight the main effort. During their
  employment, the corps integrates and synchronizes the operations of its assigned divisions and brigades. As
  the corps performs these functions, it prepares the formation to bring all of its capabilities and effects to bear
  on decisive points at each portion of an operation to achieve objectives and accomplish its mission. To set
  the conditions for enabling and sustaining subordinate units to achieve objectives and accomplish the mission,
  the corps manages and allocates resources within the corps formation and sets priorities for tasks and support.
  The corps uses joint capability (both lethal and nonlethal) to facilitate many of these other functions,
  especially shaping operations and massing effects at decisive points.
  ARFOR
  4-9. The corps headquarters is organized, trained, and equipped to serve as the ARFOR in campaigns and
  major operations, controlling the operations of two to five Army divisions and corps troops, supported by
  theater-level organizations across the conflict continuum. When the corps is the senior Army headquarters in
  a JTF, the corps assumes the role of ARFOR. As ARFOR, the corps executes those ADCON and ASOS
  responsibilities delegated by the ASCC for all Army forces assigned or attached to the JTF and OPCON of
  all Army units not subordinate to another component of the JTF, such as a joint special operations command
  or task force. As the ARFOR, the corps has extensive ADCON requirements, in addition to operational
  requirements, and it assumes responsibility through the theater army commander for the Service-specific
  support of all Army forces in the JOA, as well as for providing any ASOS with forces deployed in the joint
  operations area. (For additional information on the operations and administrative responsibilities of an
  ARFOR refer to Appendix B.)