text: Chapter 4
  commander’s OPLAN. Analysis products cover such topics as host-nation support, selection of lines of
  communications, determination of operational stock assets, replacement operations, and design of a
  distribution network and information technology infrastructure for the theater. In most cases these resources
  (including host-nation labor and services) will be shared with partners of other nations in accordance with
  negotiated agreements. (See FM 4-0 for more information on sustainment preparation of an operational
  environment.)
  4-62. The theater army continually analyzes, evaluates, and, when directed, expands APS to rapidly provide
  JFCs with needed Army capabilities. APS augment allocated Army rotational forces already serving in a
  theater and theater-assigned forces. The tempo and intensity of operations during crisis or armed conflict may
  not allow for the timely deployment of all of an apportioned force’s equipment sets from the United States
  via strategic airlift or sealift. Depending on the theater, this may require a large and dispersed equipment
  force posture based at multiple hardened sites. If needed, a high operational readiness rate will be maintained
  for APS that allows Army forces to fall in on the equipment and employ it within a few days of arriving in
  theater. The theater army coordinates with Army Materiel Command to maintain and optimize APS. (For
  additional information on APS, refer to ATP 3-35.1.)
  Set and Support Operational Areas
  4-63. Setting and supporting operational areas for the joint force occurs at operational and tactical echelons.
  During competition, the theater army helps identify likely joint operations areas (JOAs) for ground forces.
  The theater army ensures that the JOA includes bases and base camps needed by forces that primarily operate
  in the land domain. (See ATP 3-37.10 for a discussion on base and base camp planning.) Planners must take
  a holistic approach to understand the needs of the other Services and address Army requirements. Due to the
  large amount of information needed at the tactical echelon to properly set and support JOAs, the theater army
  usually needs to develop a multi-year plan that examines potential areas of operations (AOs). The theater
  army relies on a large number of low density and high demand units to conduct this tactical level of analysis.
  Many of these capabilities reside in the United States Army National Guard or the United States Army
  Reserve.
  Exercise Command and Control Over Army Forces in the Theater
  4-64. The theater army is the Army Service component command (ASCC), and it has the responsibility to
  control attached and assigned Army forces within the AOR through ADCON and operational control
  (OPCON) or tactical control (TACON). As the Army component of the combatant command, the ASCC is
  the ARFOR for the theater. When a subordinate JTF is established containing Army forces, the senior Army
  headquarters in that JTF is normally designated as its ARFOR. (See Appendix B for details on command and
  support relationships.)
  4-65. The theater army initially maintains control of all Army forces assigned to an AOR until control is
  passed to a subordinate JTF in a JOA. This control is usually passed from the theater army to the JTF when
  the Army force is ready for onward movement and integration into the JTF. As part of controlling Army
  forces, the theater army (or other headquarters designated as the ARFOR) maintains ADCON of Army forces
  and addresses Service responsibilities such as coordinating ASOS.
  Perform Joint Roles of Limited Scope and Duration
  4-66. While serving as the ASCC, the theater army has the capability to perform three joint roles for the
  CCDR. With augmentation, the theater army can be the theater joint force land component command, a JTF,
  or the joint force land component command to a JTF in a JOA. However, these roles can only be performed
  in limited scope, scale, and duration, unless the JFC provides significant augmentation.
  Contingency Planning for Crisis and Conflict
  4-67. A key aspect of combatant command and Service component planning during competition or crisis is
  the development of contingency plans. A contingency plan is a branch of a campaign plan that is planned
  based on hypothetical situations for designated threats, catastrophic events, and contingent missions outside
  of crisis conditions (JP 5-0). Contingency plans are branches to global, regional, functional, and combatant