text: Chapter 5
  * The threat may be applying pressure on the passing force.
  * Friendly forces may be more difficult to recognize because threat forces may be intermixed with them.
  5-163. To facilitate a rearward passage of lines, the stationary force commander develops an overlay. Once
  the overlay is prepared, the stationary commander transmits it and any amplifying information to the passing
  force commander by way of digital command and control systems. The following graphic control measures
  are included in a passage of lines overlay:
  * BHL.
  * Contact points forward of the BHL.
  * Passage points along the forward edge of the battlefield.
  * Lanes to the rear of the main battle area.
  * Assembly area.
  * Release point.
  5-164. During a passage of lines, friendly unit density in a relatively small maneuver space may cause
  problems in the ability of the commander to maintain the common operating picture in relation to the passed
  and passing units. The stationary and passing commanders should determine the best method of exercising
  mission command to avoid slowing the tempo of the operation and to reduce fratricide potential.
  Rehearsal
  5-165. A rehearsal is beneficial to all units responsible in the execution of a passage of lines operation. The
  rehearsal allows the passing and stationary unit to work through issues commonly found during this complex
  operation. The rehearsal allows for easy identification of the passage points and routes to and from areas of
  operations, and for the units to conduct a communication linkup on voice and digital communication systems.
  Other rehearsal items include the following:
  * Fire support observation plan, target execution, communication linkages, and mutual support operations.
  * Fire support coordination measures confirmation.
  * Unit routes and positioning review.
  * Obstacles, lanes, bypasses, and marking locations, and descriptions.
  * Passage points, routes, and recognition procedures. Verify these and review number of vehicles
  by type expected at each passage point.
  * Route management, contact points, and use of guide’s confirmation.
  * Locations for and movement of sustainment units. Arrange for mutual support and any transfer of supplies.
  * Locations of aid stations, ambulance exchange points, and CASEVAC procedures.
  Responsibilities
  5-166. The stationary unit is responsible for providing the passing unit with as much assistance as possible.
  Indirect and direct fire support from the stationary unit to the passing unit is pivotal to the success of the
  rearward passage of lines. Stationary unit support is especially important in covering the withdrawal of
  elements left in contact during a delay. The stationary unit's fire support assets answer calls for fire from the
  passing unit until battle handover occurs. The passing unit's fire support assets echelon rearward to provide
  continuous fire support for the passing unit until it successfully transitions. Once the passing unit hands over
  control of the battle to the stationary unit, the stationary unit initiates and clears calls for all fires forward of
  its location. The same procedure applies to the dedicated air defense assets of the passing and stationary units.
  5-167. The stationary unit’s engineer assets provide support to prepare the defense and execute the passage.
  Priority of effort initially ensures that the passing unit can move through passage lanes around the stationary
  unit’s defensive positions. The passing unit shifts to close these passage lanes once the passing unit and any
  security elements disengage and withdraw through the security area and obstacles. The stationary unit
  provides the passing unit with the previously coordinated combat service support as far forward as possible.
  The stationary unit concentrates on providing the passing unit with emergency medical, recovery, and fuel
  supplies so the passing unit can move through the stationary unit’s positions rapidly.