text: Appendix C
  area. The field army’s focus is on setting the conditions for corps and divisions to defeat enemy formations
  to achieve their initial objectives and prepare for future operations. Field armies have access to diverse
  capabilities across domains and warfighting functions to support the BCT as the primary executor of combat
  operations in the close area.
  Planning Considerations for the Close Area
  C-17. In the close area, the primary considerations of the corps and division formations are enabling
  subordinate units operations against enemy maneuver formations. Corps and division commanders and staffs
  enable subordinate operations by—
  * Controlling the movement of large units.
  * Maintaining an uninterrupted flow of sustainment activities to enable sustained combat operations.
  * Maintaining tempo to prevent enemy forces from regaining the initiative.
  * Creating and maintaining the flexibility to exploit windows of opportunity across domains.
  * Sustaining the ability to converge capabilities across domains against enemy vulnerabilities.
  * Protecting critical infrastructure and key lines of communication for future operations.
  * Managing boundaries and control measures.
  * Massing combat power at decisive points, spaces, and times.
  C-18. Operations in the close area are planned in future operations but they are executed by current
  operations, primarily in the current operations integration center. Commanders may choose to deploy a
  tactical command post to provide command and control of a critical part of an operation.
  REAR AREA
  C-19. Rear area operations occur in the portion of the commander’s AO that extends forward from the
  commander’s rear boundary to the rear boundary of the commander’s subordinate units. It is an area where
  most of the forces and assets locate that support and sustain forces in the close area. Rear operations are
  controlled from the support area, but they generally occur across the width and depth of the broader AO.
  Within a division or corps, rear command posts have designated coordinating authorities to ensure that
  operations are deconflicted and synchronized with the overall plan. Theater and field armies do not have a
  separate command post to assist in the management of rear area operations; all of their operations are usually
  controlled out of their main command posts.
  Defining the Rear Area
  C-20. Rear area operations are focused on ensuring freedom of action and reach in current and future
  operations. In linear terms, these actions occur behind lead maneuver formations. At the tactical level, these
  operations ensure the tempo of combat, ensuring that commanders have the agility to exploit opportunities
  without hesitation or delay. At the operational level, these operations focus on the next phase of the campaign
  or major operation. These operations are numerous, complex, and continuous. Four activities in particular
  occur in the rear area, and they must be accounted for: assembly and movement of reserves, redeployment of
  fire support, the movement of tactical units through the area, and the maintenance and security of sustainment
  and command and control.
  C-21. Reserves must be positioned to support their anticipated commitment, and their probable routes must
  be free of obstruction. Likewise, fire support assets must be deployed and redeployed to support current and
  future operations. While the majority of sustainment and command and control assets will be deployed inside
  of the support area, they will have elements conducting operations outside of the support area that must be
  accounted for by the rear command post. Finally, tactical units will be moving through the rear area into and
  out of the close area and combat operations. All of these activities will compete for limited terrain and lines
  of communications to support their operations. (See paragraphs C-29 through C-37 for more information on
  the support area.)
  C-22. A JFC normally establishes JSAs in the territory of a sovereign host nation. Because of this, theater
  and field army rear areas generally reside in an area where the host nation retains some level of control and