text: Security Operations
  Figure 5-15. Reinforced ABCT performing defensive cover
  Flank and Rear Defensive Covering Forces
  5-118. The planning and execution considerations for flank and rear defensive covering forces are the same
  as for a frontal covering force. A rear covering force mission is similar to a rear guard mission. A rear
  covering force protects a force moving away from the enemy. The BCT deploys behind the forward maneuver
  units of the main body, conducts battle handover and passage of lines, and then defends or delays.
  Alternatively, the covering force may conduct a relief in place as part of a deception plan or to take advantage
  of the best defensive terrain.
  5-119. The BCT deploys its subordinate units abreast and in-depth. The subordinate units establish passage
  points and assist in the rearward passage of the main body as needed. From that point on, the mission is
  conducted the same as any other defensive covering force operation. As the main body moves, the covering
  force displaces to subsequent PLs in-depth. If the enemy does not follow the withdrawing forces, contact
  may be lost eventually. Fighting a defense or delay is necessary if the enemy detects the movement and attacks.