text: Tactical Control Measures
  Figure A-19. Phase lines
  Position Area for Artillery
  A-34. A position area for artillery is an area assigned
  to an artillery unit to deliver surface to surface
  fires. A position area for artillery (PAA) is not an AO
  for the artillery unit occupying it. Commanders assign
  PAAs for terrain management and for locations where
  individual artillery systems can maneuver to increase
  their survivability. Establishing a PAA lets other
  subordinate units know they should avoid occupying
  that same terrain. While the exact size of a PAA
  depends on mission variables, a Paladin platoon
  normally requires a PAA encompassing over 4 square
  kilometers whereas a multiple launch rocket system
  (known as MLRS) platoon requires 9 square
  kilometers. Figure A-20 depicts a PAA.
  Figure A-20. Position area for artillery
  A-35. The maneuver echelon operations officer of the
  unit that owns the terrain establishes the PAA. The
  occupying artillery unit does not have the same authority and responsibilities toward the PAA that are
  associated with a unit assigned an assigned area. For example, other units can move through a PAA without
  clearing that movement with the artillery unit. However, to prevent fratricide or inadvertently concentrating
  forces units should make attempt to contact the artillery unit to determine if the PAA is occupied.
  Additionally, units moving through or occupying terrain within a PAA should be cognizant of the increased
  risk of receiving indirect fire from enemy artillery due to enemy counterbattery or preparatory fires. The
  artillery unit occupying a PAA establishes liaison with the unit that owns the assigned area where the PAA