text: FM 7-100.1________________________________________________________________________________
  (A) In terms of altitude (B) In terms of direction (axis) (D) In terms of lines (no air superiority)
  30,000 m
  Zone lll:
  Zone of responsibility
  of SAM units.
  Fighter aviation may
  operate only in complicated
  situations and by special
  permission.
  7000 m
  Zone ll: (C) In terms of targets (E) In terms of lines (with air superiority)
  Zone of responsibility
  of fighter aviation.
  SAM units may
  operate only
  in complicated
  situations and
  by special
  permission.
  2000 m
  Zone l:
  Zone of
  responsibility
  of AA guns and
  low-altitude
  SAMs.
  Legend:
  Enemy Aircraft SAM Battalion SAM Battery AA Gun Battery
  Coverage Combat Air Patrol
  Figure 9-1. Coordination of Fighter Aviation and Ground-Based Air Defenses (Examples)
  9-42. Another way of dividing air defense responsibility is in terms of lines.
  Particularly when the OPFOR does not have air superiority, the first line(s)
  of air defense responsibility could be for ground-based air defense weapons to
  engage enemy aircraft. OPFOR fighter aviation would then operate in the
  relatively safe airspace behind those lines, where its fighters would engage
  only those aircraft that managed to get through the first line(s). See example
  D in Figure 9-1.
  9-43. If the OPFOR does have air superiority, it might establish a boundary
  line parallel to and forward of the battle line. This boundary would be gener-
  ally at the range limit of medium-range SAMs, possibly beyond the supported
  ground force unit’s limit of responsibility. Ground-based air defense systems
  would engage aircraft out to this boundary. Fixed-wing aircraft would engage
  the enemy beyond this boundary. See example E in Figure 9-1. However, the
  OPFOR is unlikely to use this technique unless it possesses air superiority.
  9-44. There will never be sufficient specialized air defense assets to protect
  all units and vital assets from air attack. Therefore, all units must be capable
  of using their organic weapons for self-defense against air attack. Self-
  defense is never denied. Thus, air defense units with short-range weapons
  always have the capability to defend themselves from immediate air threats,
  regardless of whether another aviation or ground-based air defense unit has
  responsibility for the airspace above them.