text: Chapter 20
  it attacks, but once having conducted the linkup, it can expect to continue the mission (even if it is to remain
  in place and defend), which will require even more supplies.
  EXECUTION FOR A LINKUP
  20-21. The commander must be able to observe the progress of the operation. Generally, this means that
  the commander will follow the lead force. If a particular flank is of concern during the operation or a
  supporting attack is required to penetrate the enemy’s lines, then the unit will place a headquarters where it
  can observe the force’s secondary action. The commander and operations officer must remain in
  communication throughout the operation, using the main command post if necessary to relay messages. The
  staff must maintain the tempo of the operation because a stalled force is difficult to get moving again. Forces
  must have the ability to move forward from time to time to continue the forward momentum on the operation.
  The staff monitors the actions of subordinate forces to ensure that the control measures established in
  planning the operation are still valid. The staff will issue a fragmentary order for changes as necessary.
  20-22. As the force begins to maneuver, the intelligence staffs will monitor the enemy situation. They will
  also monitor the situation facing the linkup force. Together this information will portray an overall enemy
  disposition which will greatly assist the intelligence staffs in calculating the enemy’s most probable course
  of action. The intelligence staffs identify as far in advance as possible the direction, strength, and time of the
  enemy counterattack. Likewise, they will also advise the commander of any identifiable weaknesses within
  the counterattack.
  20-23. The initial conduct of the linkup will be identical to a movement to contact or deliberate attack,
  depending on the enemy situation. As the forces begin to maneuver, they will attempt to establish and
  maintain contact with their corresponding friendly force. Each force will monitor the progress of the other,
  adjusting the plan as necessary. The linkup point can be moved closer to the linkup force if it is unable to
  travel at a speed proportionate with the plan. Similarly, the fire control measures will also adjust. As the two
  forces draw closer, higher headquarters controls the maneuvering forces. If possible, the forces will also
  attempt to establish contact on a predesignated frequency to control the actual linkup. At this point, the
  momentum of the operation will slow to help prevent fratricide. The tradeoff may be that some enemy forces
  may slip between the two closing forces. Coordination signals identify each force as it approaches the linkup
  point.
  20-24. The fire control measures shift based on the progress of the forces and the enemy situation.
  Specifically, the coordinated fire lines, which will initially protect each force as it maneuvers, change to
  protect the two forces as they begin to meet. Restricted fire lines prevent fratricide between the linkup forces.
  Once the linkup has occurred, the stationary and linkup forces organize as per the higher headquarters’ plan
  for future operations. If possible, the air defense elements in both linkup forces should monitor the same early
  warning net. This is particularly important if the linkup is attempting to reach an encircled force. This unity
  of air defense effort will ensure the most appropriate use of weapon systems and reduce unnecessary
  redundancy. Once the linkup is complete, air defense assets may be reorganized to support the next operation.
  20-25. The engineers will provide mobility support to the higher headquarters, probably as attached
  elements of the lead forces. Once the linkup is complete, engineers may assist in countermobility or
  survivability operations depending on the plan. Another task organization may be required on the objective
  to accomplish the new missions.
  20-26. Sustainment priorities focus on the forward movement of the force. Evacuation will be forward to
  logistics resupply points, reducing the turnaround time for recovery assets. As the linkup forces begin to
  close, sustainment assets must be as far forward as possible. Time is essential to the success of this operation,
  so assets must be prepared to keep pace with extremely fast operations. They must be prepared to address the
  immediate needs of the encircled force, to stockpile ammunition, or to move to other positions if the force
  should revert to a defensive posture.