text: Reconnaissance
  Figure 12-2. Example of area reconnaissance control measures
  12-54. Units place additional control measures on recognizable terrain where possible. They locate contact
  points where they determine that it is necessary for adjacent units to make physical contact and the time the
  contact takes place. They use phase lines to coordinate the movement of elements operating abreast.
  Checkpoints indicate critical terrain features and help to control ground movement and coordinate air-ground
  integration. Commanders use FSCMs to control direct and indirect fires. They use additional control
  measures as necessary. In addition, commanders assigning the area reconnaissance mission specify the routes
  their reconnaissance units will use to enter their assigned areas. Units depart these assigned areas on different
  routes upon completion of their area reconnaissance tasks.
  12-55. Units inform the commander assigning the mission if they lack the time or resources to complete all
  the tasks listed in paragraph 12-51. Their respective commanders then issue further guidance on which tasks
  each unit needs to complete or the respective priority of these tasks. Their different reconnaissance objectives
  may make it clear which tasks are more important. These units report and await further instruction if they
  determine that they cannot complete assigned tasks after initiating their reconnaissance efforts. This includes
  such things as clearing enemy forces from their assigned areas or supporting the maneuver of their respective
  main bodies by reducing obstacles to create lanes. (See FM 3-98 for additional information on the
  performance of area reconnaissance.)