text: FM 7-100.1________________________________________________________________________________
  4-127. Since a part of the disruption force mission to attack the enemy’s
  combat system, the following are typical targets for attack:
  • C2 systems.
  • RISTA assets.
  • Precision fire systems.
  • Aviation assets in the air and on the groundat attack helicopter
  forward arming and refueling points (FARPs) and airfields.
  • Logistics support areas.
  • LOCs.
  • Mobility and countermobility assets.
  • Casualty evacuation routes and means.
  4-128. In some cases, the disruption force can have a single mission of detect-
  ing and destroying a particular set of enemy capabilities. This does not mean
  that no other targets will be engaged; it means that, given a choice between
  targets, the disruption force will engage the targets that are the most damag-
  ing to the enemy combat system.
  Main Defense Force
  4-129. The units of the main defense force conducting an area defense occupy
  battle positions in complex terrain within the battle zone. That terrain is re-
  inforced by engineer effort and C3D measures. These complex battle positions
  are designed to prevent enemy forces from being able to employ precision
  standoff attack means and force the enemy to choose costly methods in order
  to affect forces in those positions. They are also arranged in such a manner as
  to deny the enemy the ability to operate in covered and concealed areas himself.
  4-130. The main defense force in an area defense conducts attacks and
  employs reconnaissance fire against enemy forces in the disruption zone.
  Disruption forces may also use the complex battle positions occupied by the
  main defense force as refit and rearm points.
  Reserves
  4-131. An operational-level command in the area defense can employ a num-
  ber of reserve forces of varying strengths. In addition to its other functions,
  the maneuver reserve in an area defense may have the mission of winning
  time for the preparation of positions. This reserve is a unit strong enough to
  respond to unforeseen opportunities and contingencies at the operational
  level. It is normally strong enough to defeat the enemy’s exploitation force.
  The commander positions his reserve in an assembly area within one or more
  of the battle positions, based on the commander’s concept of the operation.
  (See the Reserves section above for discussion of other types of reserves.)