text: Chapter 16
  16-32. Passages of lines occur rapidly once initiated. Units perform a passage of lines when and where
  enemy forces have the least capability to detect it, such as at night or during periods of reduced visibility.
  Units consider using obscuration to screen friendly movement in any passage of lines, even at night. Each
  forward passing force’s command post passes through the stationary force’s lines as soon as possible after
  its lead elements complete their forward passage and locates where it can best control operations.
  16-33. Direct fire support by stationary forces ends when combat elements of passing forces, including their
  reserves, mask that support or move beyond direct fire range. However, artillery, air defense, and other long-
  range systems continue to support forward passing forces until previously designated events occur or a higher
  echelon headquarters directs them to conduct another mission.
  16-34. Stationary forces provide security throughout the performance of the forward passages of lines. The
  movement of the forward passing main body units begin from their assembly areas to attack positions.
  Passing forces conduct their final preparations for the passage of lines and the attack in those attack positions.
  Passing forces move to and occupy attack positions when enemy observation is unlikely. Stationary forces
  clear any obstacles from designated passage gaps, lanes, or routes. They guide passing force elements from
  contact points through passage points.
  16-35. Stationary forces’ direct and indirect fire assets normally support the movement of passing forces.
  Commanders direct any supporting electromagnetic warfare capabilities—especially electromagnetic
  attack—against enemy command and control nodes. Their objective is to disrupt the enemy force’s
  dissemination of information and ability to react effectively to friendly operations. Any preparation or
  covering fires coincide with the movement of passing forces from their attack positions to passage lanes.
  16-36. After the forward moving unit commander assumes responsibility for the area, that commander
  coordinates all fire support. Depending on the situation, the passing commander may continue to use only
  the fire support assets of the stationary force until the passage of lines is complete. This allows forward
  passing force fire support assets to move forward with the rest of their unit and conserve their ammunition
  for later expenditures. On passage of responsibility, the passing unit commander also assumes control of fire
  forward of the BHL. For example, the passing unit commander moves the CFL forward to conform to the
  movement of forward security elements.
  16-37. The stationary unit provides the passing unit with the previously coordinated sustainment as far
  forward as possible. The stationary unit concentrates on providing the passing unit with emergency medical,
  recovery, and fuel supplies to enable the passing unit to move through the stationary unit’s positions rapidly.
  16-38. The principles of a forward passage of lines are the same when dissimilar forces, such as dismounted
  infantry and armored forces, are involved. However, the execution differs in that the type and amount of
  assistance provided by stationary forces changes because of the different capabilities and requirements of
  these different types of forces. The higher echelon commander ordering the passage can direct the provision
  of additional resources from other sources to meet the assistance requirements of forward passing forces.
  REARWARD PASSAGE OF LINES
  16-39. A rearward passage of lines is similar in concept to a forward passage of lines. It continues the
  defense, maintaining enemy contact while allowing for recovery of security or other forward deployed forces.
  Units may or may not conduct this operation under enemy pressure.
  PLANNING A REARWARD PASSAGE
  16-40. The planning considerations discussed in paragraphs 16-13 through 16-27 continue to apply during
  a rearward passage of lines. However, rearward movement is likely to be more difficult because—
  * The enemy force probably has the initiative, which tends to reduce the time available to perform
  liaison, reconnoiter, and make detailed plans.
  * If rearward moving forces have been in action, Soldiers are tired and possibly disorganized.
  * The enemy force may be applying pressure on the passing force.
  * Possible intermixing of friendly and enemy forces increases the probability of fratricide.