text: Chapter 1
  AGILITY
  1-27. “Agility is the ability of friendly forces to react faster than the enemy” (ADP 3-90). Automated battle
  management aids in ADA systems enable operators to execute engagements in a timely manner within the
  planned defense design and its branches and sequels. Dynamic replanning to respond to unanticipated enemy
  avenues of ingress, however, is less responsive primarily due to system centric architectures that do not allow
  cross-leveling of resources across ADA systems.
  AMD EMPLOYMENT TENETS
  1-28. While commanders should always start AMD employment planning by applying the principles
  described above, they should also strive to adhere to employment tenets (desirable attributes) when planning
  and positioning their ADA resources. A tenet is a belief, dogma, or doctrine generally held to be true. The
  AMD employment tenets are mutual support, overlapping fires and coverage, balanced fires, weighted
  coverage, early engagement, defense in depth, and resilience.
  1-29. The application of a specific tenet or tenets is METT-TC dependent. In some cases, the application of
  one tenet may only be achieved at the expense of another, as noted below.
  MUTUAL SUPPORT
  1-30. Weapons are positioned so that the fires of one weapon can engage targets within the dead zone of the
  adjacent weapon. For guns, this dead zone is usually small. For missiles, the dead zone may be large, and
  mutual support is a critical element. Mutual support can also cover nonoperational weapons or weapons at
  lower states of readiness. Mutual support, when applied to sensors has the same connotation; that is, sensors
  are deployed to cover the dead zone of adjacent sensors. The application of sensor mutual support is
  challenging due to the need to pair weapons and sensors by system and the scarcity of ADA systems.
  OVERLAPPING FIRES AND OVERLAPPING COVERAGE
  1-31. Weapons are positioned so that their engagement envelopes overlap. Because of the many altitudes
  and ranges from which the enemy can attack or conduct surveillance operations, defense planners must apply
  mutual supporting and overlapping fires vertically and horizontally. Overlapping coverage is the positioning
  of sensors such that their coverage does not leave any seam in the defense that might be used by ingressing
  threats. Overlapping fires and overlapping coverage should be planned during defense design. Achieving
  overlapping coverage against ballistic threats is a challenge because of the need to orient primary target lines
  toward ballistic launch zones and the system architectures that require system-specific sensors to support
  system-specific weapons. Overlapping coverage against low altitude non-ballistic threats is challenged by
  terrain impacts on ground-based sensor visibility and the aforementioned system-specific limitations.
  BALANCED FIRES
  1-32. Weapons are positioned to deliver an equal volume of fires in all directions. This is necessary for AMD
  in an area where the terrain does not canalize the threat or when the avenues of approach are unpredictable.
  Against cruise missiles and other non-ballistic missile threats, balanced fires is a desired characteristic of
  defense design.
  WEIGHTED COVERAGE
  1-33. Weapons coverage is combined and concentrated toward the most likely threat air avenues of approach
  or direction of attack. Based on the tactical situation, a commander may risk leaving one direction of attack
  unprotected or lightly protected to weight coverage toward another direction. Weighted coverage is generally
  desirable when designing defenses to defeat ballistic threats. Weighted coverage and balanced fires are not
  mutually achievable, requiring the defense designer to give up most aspects of one to achieve the other.