text: Chapter 3
  assume greater responsibilities to enable its tactical commands to succeed. Depending on the circumstances,
  this may require temporary augmentation from other sources, or permanent changes to its table of
  organization and equipment or table of distribution and allowances.
  3-6. Every combatant command has an ASCC, and the theater army is the ASCC for the geographic
  combatant commander. Currently the Army has six theater armies, one for each GCC as shown in table 3-1.
  Each of these theater armies is a formation with the ability to command and control subordinate corps and
  division formations during limited contingency operations and tailor the appropriate force to meet the GCC’s
  operational requirements. However, during large-scale combat operations and in the absence of a field army,
  the theater army requires significant headquarters augmentation to serve as the land component command
  for a multi-corps operation in a joint operations area.
  Table 3-1. Theater armies
  Geographic Combatant Theater Army
  Command
  U.S. Indo-Pacific Command U.S. Army Pacific
  U.S. European Command U.S. Army Europe - Africa
  U.S. Central Command U.S. Army Central
  U.S. Africa Command U.S. Army Europe - Africa
  U.S. Southern Command U.S. Army South
  U.S. Northern Command U.S. Army North
  THEATER ARMY HEADQUARTERS
  3-7. The theater army is a formation consisting of a headquarters and assigned theater-level enabling
  forces. The theater staff must be able to plan, prepare, and assess operations across the theater and in a JOA.
  Because the requirements for each geographic combatant command are unique, each theater army must tailor
  the organization of its headquarters to address specific AOR challenges. To accomplish its roles and
  responsibilities, the theater army headquarters has a main command post and a contingency command post.
  MAIN COMMAND POST
  3-8. The theater army main command post performs operational-level command and control of day-to-day
  operations and maintains crisis action planning capabilities. It assists in the development and maintenance of
  operation plans, contingency plans, and Service supporting plans for the combatant commander’s campaign
  plan. It controls Army forces involved in operations, training exercises, and other security cooperation
  activities.
  3-9. The main command post can also coordinate collaborative planning with any Army headquarters
  designated to deploy in the AOR. It provides planning support to the contingency command post when it
  deploys command forces involved in limited contingencies or to participate in exercises and other theater
  security cooperation activities. The main command post has limited operational responsibilities for Army
  forces operating in a JOA; however, it provides support such as intelligence analysis and long-range planning.
  3-10. The theater army’s main command post performs all of the ASCC functions, including 10 USC;
  ADCON; ASOS; and support to a JOA. These functions support the combatant commander’s daily
  operational requirements.
  3-11. The main command post also manages the support given Army, joint, and multinational forces
  deployed to joint operations areas established in the AOR. This support includes theater opening, reception,
  staging, onward-movement, and integration; common-user logistics; and other services associated with Army
  support responsibilities. Most of these responsibilities are sustainment related and supported by a subordinate
  TSC. (See ATP 3-93 for more information on the organization and responsibilities of a main command post.)