text: Division Roles, Functions, and Organizations
  detachment provides additional depth to the division staff for sustained operations. The MEB is integral to
  command and control of the division support area. If a division does not have a MEB, then it must either
  assign another organization to control the division support area or assume direct control itself. Additionally,
  without a MEB to collaborate with the rear command post, a division headquarters would either have to
  integrate with another organization or devote additional staff and equipment from the main command post to
  properly staff the rear command post. When a division is preparing to deploy, commanders, staffs, and
  planners must take care to coordinate for Reserve Component mobilization with enough time to assemble the
  formation for deployment. Alternatively, the division may not have enough time to incorporate mobilizing
  members prior to deployment and must assemble the entire formation in theater, secure resources and
  capabilities from other formations until mobilized forces arrive, or operate without the key elements of the
  formation.
  Note. The MEB is an integral part of a division’s ability to command and control in the division
  support area. The mobilization and deployment of the MEB must be prioritized in division
  planning and operations to ensure that it arrives as early as possible. Depending upon the situation,
  division commanders may consider deploying their MEB ahead of their BCTs.
  DIVISION HEADQUARTERS
  5-22. A division headquarters is organized and equipped for sustained combat operations. By design, it
  resembles the corps headquarters, but it has different manning and equipment. The headquarters and
  headquarters’ battalion consists of a main command post, a tactical command post, a rear command post, and
  a mobile command group. When necessary, a division can form an early entry command post. Plans and
  operations across the staff sections, cells, command posts, and echelons are facilitated by a network and suite
  of command and control systems to enhance collaboration and synchronization. The division commander
  may command the division from any of the command posts.
  HEADQUARTERS AND HEADQUARTERS BATTALION
  5-23. The division headquarters and headquarters’ battalion provides all administrative support, life support,
  communications, and transportation for the division’s command posts and mobile command group. The
  headquarters and headquarters’ battalion has a complete battalion staff. The headquarters and headquarters’
  battalion consists of two companies with distinct missions: the headquarters and support company, and the
  signal, intelligence, and sustainment company. Based on the mission and operational variables, a division
  headquarters may require additional security elements to augment the headquarters and headquarters’
  battalion.
  5-24. The organization of the division headquarters and headquarters’ battalion is similar to that of the corps
  headquarters and headquarters battalion. The headquarters and support company includes life support and
  maintenance sections for the division command posts and provides administrative support to the movement
  and maneuver, fires, and protection sections of the staff. The signal, intelligence, and sustainment company
  provides administrative support to the signal, intelligence, and sustainment sections of the division staff. It
  connects the division headquarters into the Army global network enterprise, and through it, into the DODIN.
  The signal company ties into the network through a supporting expeditionary signal battalion from either the
  corps or theater signal brigade, depending upon the division’s role. Both companies task-organize to support
  the division command posts.