text: Defense
  7-46. Effective division airspace control is contingent on the development of a unit airspace plan that
  includes subordinate BCT airspace coordinating measures that synchronize airspace users and activities
  supporting the BCT. Airspace control is essential for deconflicting manned and unmanned aircraft from
  indirect fires. Properly developed airspace coordinating measures enable the BCT to mass aerial and
  surface-based fires simultaneously while using unmanned assets to maintain surveillance. (See JP 3-52,
  FM3-52,and ATP3-52.1for additional information on airspace control and ATP 3-91.1 for information on
  thejoint air-ground integration center [JAGIC].)
  7-47. During the conduct of defensive operations,situations requiring denial operations,defending encircled,
  andstay-behind operations have their own unique planning,preparation,and execution considerations. In the
  defense, denial operations conducted to deprive the enemy of some or all of the short-term benefits of
  capturing an area may be required. Denying the enemy, the use of space, personnel, supplies, or facilities
  may include destroying, removing, and contaminating those supplies and facilities or erecting obstacles.
  Subordinate units of the BCT when encircled can continue to defend, conduct a breakout—an operation
  conducted by an encircled force to regain freedom of movement or contact with friendly units (ADP 3-90)—
  from encirclement,exfiltrate toward other friendly forces,or attack deeper into enemy-controlled territory.
  In other defensive situations,subordinate units may be directed to conduct operations as a stay behind force.
  These actions may be planned or forced by the enemy.
  7-48. A common additional action planned or forced by the enemy can include a relief in place. A relief in
  placeis an operation in which,by direction of higher authority,all or part of a unit is replaced in an area by
  the incoming unit and the responsibilities of the replaced elements for the mission and the assigned zone of
  operations are transferred to the incoming unit (JP 3-07.3).
  Note.The Army uses an area of operations instead of a zone of operations.
  7-49. The BCT normally conducts a relief in place as part of a larger operation, primarily to maintain the
  combat effectiveness of committed forces. The higher headquarters directs when and where to conduct the
  relief and establishes the appropriate control measures. Normally,during the conduct of combat operations,
  the unit relieved is defending. However,a relief in place may set the stage for resuming offensive operations
  or serve to free the relieved unit for other tasks.
  7-50. There are three types of relief in place operations:
  (cid:122) A sequential relief in place occurs when each element within the relieved unit is relieved in
  succession,from right to left or left to right,depending on how it is deployed (ADP 3-90).
  (cid:122) Asimultaneous relief in placeoccurs when all elements are relieved at the same time (ADP 3-90).
  (cid:122) A staggered relief in place occurs when a commander relieves each element in a sequence
  determined by the tactical situation,not its geographical orientation (ADP 3-90).
  INTELLIGENCE
  7-51. IPB helps the BCT commander determine where to concentrate combat power,where to accept risk,
  and where to plan the potential decisive operation. The staff integrates intelligence from the higher echelon’s
  collection efforts (see chapter 5,section I) and from units operating forward of the BCT’s area of operations.
  Information collection includes collection from spot reports, tactical unmanned aircraft systems (known as
  TUASs),and other higher-levelcollection assets. Early warning of enemy air attack,airborne or helicopter
  assault or insertion, and dismounted infiltration are vitally important to provide adequate reaction time to
  counter these threats as far forward as possible. The essential areas of focus are terrain analysis,determination
  of enemy force size and likely COAs with associated decision points, and determination of enemy
  vulnerabilities.
  7-52. Intelligence operations,conducted by the military intelligence company,collect information about the
  intent, activities, and capabilities of threats and relevant aspects of the operational environment to support
  commanders’ decision-making (see chapter 5, section IV). The commander uses intelligence products to
  identify probable enemy objectives and approaches and develops NAIs and TAIs from probable objectives
  and approaches. The commander studies the enemy operation patterns and the enemy’s vulnerability to