text: Appendix B
  B-30. The theater army initially maintains control of all Army units assigned to an AOR until that control is
  passed to the senior Army force or ARFOR in a subordinate JOA. As part of the controlling of Army forces,
  the ARFOR maintains ADCON of Army forces and addresses Service responsibilities such as coordinating
  ASOS. (See ADP 4-0 for more information on ASOS.)
  FIELD ARMY AS AN ARFOR
  B-31. Large-scale combat operations often require the Army to conduct land operations with multiple
  corps-sized formations as part of a joint or multinational command. Large-scale combat operations could
  require a theater army headquarters to expand and transform into an operational land headquarters (field army
  equivalent) exercising command over multiple Army corps and a Marine expeditionary force.
  B-32. A field army (when constituted) performs operational ARFOR tasks and is the Army component of the
  joint force to which it is assigned. A field army, specifically tailored to mission requirements, may be
  assigned to a joint force command with an enduring operational requirement. Typically, a subunified
  command is established instead of a JTF when a military operation is anticipated to be enduring. In this case,
  a field army would be appropriate as the Army component or ARFOR to the subunified command. The
  theater army exercises ADCON over the field army and its subordinate Army forces, and it provides the field
  army and its joint force command with all Army Service functions.
  CORPS AS AN ARFOR
  B-33. The corps headquarters is organized, trained, and equipped to serve as the ARFOR in campaigns and
  major operations. This is done when commanding two or more Army divisions, while also coordinating with
  supporting theater-level organizations, across the range of military operations. As the ARFOR for the JFC,
  the corps serves as an operational-level headquarters, conducting land operations as the Service component.
  A corps commander and staff should not attempt to simultaneously perform the roles of a JTF and an ARFOR
  headquarters during major operations. The workload associated with simultaneously conducting these two
  roles can overwhelm the commander and staff. The corps can control up to five Army divisions in large-scale
  combat operations. The corps normally has an assigned ESC and one medical brigade (support) in direct or
  general support. Other theater-level assets are attached as required. The corps allows other theater-level assets
  to adapt to operational- or tactical-level roles depending upon the combatant commander’s requirements.
  B-34. In addition to operational requirements, the corps has extensive ADCON responsibilities as the
  ARFOR. When it serves as the ARFOR, the corps is responsible through the theater army commander for
  the Service-specific support of all Army forces in a JOA and for providing any ASOS with forces deployed
  in a JOA. The Army force package attached to the ARFOR receives the sustainment necessary to conduct
  land operations effectively and indefinitely. The corps commander must balance responsibility for Service
  component actions while communicating requests for support from various theater-level commands and
  units.
  B-35. The JTF commander sets priorities for Army sustainment and support to other Services while
  delegating most 10 USC tasks and ASOS to these commands. Sustainment is assigned to the corps ESC.
  Medical units remain in a general support role to all forces in an AO. Air units require centralized control of
  air and missile defense engagements through the joint air operations center, and signal units must integrate
  into an AOR-wide network. Therefore, these units may remain attached to the theater commands and provide
  direct or general support. Attachment of units—such as the civil affairs, engineers, military police, and
  aviation—allows the corps commander to allocate their capabilities among the division, corps, and
  multinational units.
  DIVISION AS AN ARFOR
  B-36. A division commands multiple Army brigades and is one of the Army’s tactical headquarters for
  decisive action. When required it may serve as a JTF or joint force land component headquarters in a limited
  contingency operation. As required, a division may be the ARFOR and the joint force land component in a
  JTF. When the division headquarters serves as a JTF headquarters or a joint force land component
  headquarters, it requires joint augmentation.