text: Tactical Control Measures
  A-69. Before assigning a strong point mission, commanders ensure that the strong point force has sufficient
  time and resources to construct the position. A minimally effective strong point typically requires one day of
  effort from an engineer unit the same size as the unit defending the strong point. Normally, companies and
  battalions occupy strong points, although brigades may construct them. Units do not normally establish strong
  points for units smaller than company size. This is because a platoon or squad cannot secure a perimeter large
  enough to contain all required assets and supplies.
  A-70. Units as large as battalion task forces and as small as squads or sections use BPs. Commanders select
  positions based on terrain, enemy capabilities, and friendly capabilities. A commander can assign all or some
  subordinates’ BPs within their BP. Figure A-32 depicts a combined arms battalion BP.
  A-71. A commander may assign subordinates BPs in situations when there is a need to retain a greater degree
  of control over the maneuver of subordinate units than that provided through only using an assigned area, as
  the higher unit controls maneuver outside the general location of the BP. A commander can assign multiple
  BPs to a single unit, which allows that unit to maneuver between BPs. The commander specifies mission and
  engagement criteria to the unit assigned to a BP. Security, functional and multifunctional support, and
  sustainment forces typically operate outside a unit’s BP. Figure A-33 on page A-22 depicts a brigade assigned
  area with battalion BPs.
  A-72. Units occupy or depart BPs as part of the overall plan. The commander assigning a unit to a BP should
  specify when and under what conditions the unit can displace from the position, since a BP is not normally
  held at all costs. If a higher echelon commander orders a unit to defend a BP, its commander has the option
  of moving off the BP. If a higher echelon commander directs a unit to retain a BP, the subordinate commander
  needs to know the specific conditions that need to exist before the unit can displace.
  Figure A-32. Combined arms battalion with company battle positions