text: Fire Support Coordination Measures
  shaped airspace coordination area, and the effective date-time group or the words "on-order." Informal
  airspace coordination areas are not normally displayed on maps, charts, or overlays.
  COORDINATING ALTITUDE
  B-89. The coordinating altitude is an airspace coordinating measure that uses altitude to separate users and
  as the transition between different airspace control elements (JP 3-52). Examples of Army airspace control
  elements include ADA and Army corps, division airspace elements. Army echelons incorporate airspace
  control plan guidance and integrate the ACO, area air defense plan, special instructions, and the ATO via
  OPORDs. All airspace users should coordinate with the appropriate airspace control elements when
  transitioning through or firing through the coordinating altitude.
  B-90. The requirement to integrate airspace use in support of ground fire missions requires the determination
  of the firing locations, the impact location, and the airspace that will be transited by the projectile during
  flight. Those projectile parameters are integrated with other airspace users. Service liaisons and airspace
  control agencies work closely to ensure that appropriate ACMs and FSCMs integrate surface operations and
  airspace operations.
  COORDINATION LEVEL
  B-91. Coordination level is an airspace coordinating measure below which fixed-wing aircraft normally will
  not fly (JP 3-52). To prevent friendly fire incidents and manage operational risk, all airspace users should
  coordinate with the appropriate airspace control elements when flying or firing through a coordination level.
  RESTRICTED OPERATIONS ZONE
  B-92. The restricted operations zone is airspace reserved for specific activities in which the operations of
  one or more airspace users is restricted (JP 3-52). Some typical uses are to restrict air operations over artillery
  launch and target areas, UAS launch, and recovery areas and areas identified by the area air defense
  commander as "weapon free" zones.
  B-93. A ROZ is graphically shown as an area enclosed by a solid black line. Depicted inside the enclosed
  area are "ROZ," the establishing HQ, the minimum and maximum altitudes, the grid coordinates for each end
  of the baseline, figure outline grid coordinates, or the center point grid coordinate and radius in m, and the
  effective date-time group or the words "on-order."
  B-94. For more information on the airspace coordination area, coordinating altitude, ROZ, and other ACMs,
  see FM 3-52, ATP 3-52.1, JP 3-09.3, and JP 3-52.