text: Chapter 6
  Security Forces
  6-132. The securityforces for a BCT conducting a movement to contact,normally consists of the advance
  guard and,if required,flank and rear security forces. The advance guard has sufficient forces to protect the
  main body from surprise attack. The positioning of flank andrear forces depends on the proximity of friendly
  units to the flank or rear and to the enemy.
  Advance Guard
  6-133. An advance guard is a task organized combined arms unit that precedes the main body and provides
  early warning, reaction time, and maneuver space (see figure 6-14). The BCT commander organizes an
  advance guard to lead the BCT with or without a covering force from a higher echelon. When a covering
  force from a higher echelon is employed forward of the BCT,the advance guard maintains contact with the
  covering force. The advance guard requires antiarmorand engineer support and remains within range of the
  main body’s indirect-fire systems. The advance guard reduces obstacles to create passage lanes,repairs roads
  and bridges, and locates bypasses. For obstacles not covered by fire, the advance guard can either seek a
  bypass or create the required number of lanes to support its maneuver or the maneuver of a supported unit’s
  maneuver. For obstacles covered by fire,the unit can either seek a bypass or conduct a breaching operation.