text: Chapter 6
  Figure 6-18. Notional organization of forces for the assault
  Reserve
  6-177. A reserve is that portion of a body of troops that is withheld from action at the beginning of an
  engagement,to be availablefor a decisive movement (ADP 3-90). The reserve is not a committed force and
  is not used as a follow and support force or a follow and assume force. The commander uses the reserve to
  exploit success,to defeat enemy counterattacks,or to restore momentum to a stalled attack.
  6-178. Once committed,the reserve’s actions normally become or reinforce the BCTs decisive operation.
  The commander makes every effort to reconstitute another reserve from units made available by the revised
  situation. Often a commander’s most difficult and important decision concerns the time,place,and conditions
  for committing the reserve.
  6-179. In an attack,the commander prioritizes the positioning of the reserve to reinforce the success of the
  decisive operation,then to counter enemy counterattacks. The reserve must be able to move quickly to areas
  where it is needed in different contingencies. This is most likely to occur if the enemy has strong
  counterattack forces. Once committed, the reserve’s actions normally become or reinforce the echelon’s
  decisive operation or main effort,and the commander makes every effort to reconstitute another reserve from
  units made available by the revised situation.
  Sustainment
  6-180. The BCT commander resources sustainment assets to support the attacking force. The BSB
  commander and BCT subordinate maneuver commanders organize sustainment assets to support the BCT’s
  concept of support. The BSB commander controls the sustainment for the BCT with priority of support to