text: Chapter 4
  4-90. Mobility tasks are those combined arms activities that mitigate the effects of obstacles to enable
  freedom of movement and maneuver (ATP 3-90.4). Mobility includes the following primary tasks:
  * Conduct breaching.
  * Conduct clearing (areas and routes).
  * Conduct gap crossing.
  * Construct and maintain combat roads and trails.
  * Construct and maintain forward airfields and landing zones.
  * Conduct traffic management and control.
  4-91. When properly task-organized, the MEB staff can plan, direct, integrate, and control engineer, military
  police, and CBRN capabilities and request EOD capabilities necessary to clear an area, location, or line for
  communication of obstacles or impediments. The support area designated land owner conducts this operation
  throughout the support area to support movement corridors, rapid runway repairs, and horizontal
  construction. See ATP 3-90.4 for additional information on mobility.
  4-92. Countermobility operations are those combined arms activities that use or enhance the effects of natural
  or man-made obstacles to deny enemy freedom of movement and maneuver. When properly task-organized,
  the MEB commander’s staff can plan direct, integrate, and control the capabilities necessary to alter the
  mobility of adversaries. The MEB may conduct this operation in the support area as part of security and
  defense while ensuring that these countermobility actions do not impair future friendly force freedom of
  movement. Key countermobility tasks may include (see ATP 3-90.8)—
  * Site obstacles.
  * Construct, emplace, or detonate obstacles.
  * Mark, report, and record obstacles.
  * Obstacle integration.
  REAR COMMAND POST
  4-93. The rear command post provides echelon (corps and division) oversight, planning, synchronization,
  direction and/or coordination of sustainment activities, terrain management, protection, stability tasks,
  boundary and operational transition management, host-nation coordination and support, and integration
  (reception, staging, and onward movement) of arriving forces throughout rear areas.
  4-94. When established, the rear command post is the command post that deconflicts, prioritizes,
  coordinates, and synchronizes rear area operations for the supported echelon (corps/division) and should not
  duplicate the tasks assigned to the MEB, BCT, or sustainment brigade. It has similar responsibilities to the
  tactical command post, and in certain cases may take the fight from the main command post. The rear
  command post enables the corps or division commander by unifying the efforts of combat, functional, and
  multifunctional units that operate in the support area and, when applicable, the rear area to ensure
  uninterrupted support to the main effort. When synchronized, these efforts enable the corps or division to
  maintain tempo and operational reach.
  4-95. The rear command post echelon headquarters task-organizes units for network connectivity, life
  support, transportation, medical support, and security for the rear command post. Corps and division
  commanders may use the rear command post to provide command supervision and general officer oversight
  for—
  * Performing terrain management and movement control.
  * Defeating threats.
  * Enabling sustainment operations.
  * Coordinating and synchronizing protection.
  * Enabling stability operations.
  * Enabling transitions.