text: Chapter 2
  engagement and when multiple engagements are necessary to achieve the desired probability of
  engagement effectiveness.
  FIRING DOCTRINE
  2-33. Firing doctrine is the application of the methods of fire to achieve the required level of
  engagement effectiveness. It is implemented in accordance with the priority of the defended assets and the
  number of available interceptors relative to the number of attackers. It may have situational variations from
  the method of fire selected.
  2-34. Patriot, for example, may select ripple fire against a ballistic missile that is part of a massed raid. The
  first shot of the ripple will occur in accordance with the selected method of fire. The second shot may be
  preempted by the need to shoot higher priority threats. THAAD may use a shoot-look-shoot, but may conduct
  the first or the last shot as a ripple fire or salvo fire depending upon engagement timelines and supporting
  ballistic missile defense fires.
  SECTORS OF FIRE AND PRIMARY/SECONDARY TARGET LINES
  2-35. A sector of fire is that area assigned to a unit, a crew-served weapon, or an individual weapon within
  which it will engage targets as they appear in accordance with established engagement priorities (FM 3-90-
  1). Sectors of fire are specified by left and right limits in azimuth and are normally designated at ADA
  battalion level for Patriot and THAAD units and platoon level for SHORAD units. Sectors of fire are a part
  of a comprehensive sensor and shooter plan that provides optimum radar coverage of the defined area and
  effective use of available ADA weapons.
  2-36. A primary target line is an azimuth assigned to a weapon system or unit along which the system
  fire control personnel and or gunners focus their attention. Primary target lines are established along the
  centerline of the assigned sector of fire to assist in the distribution of AMD fires.
  2-37. A secondary target line is a pre-planned alternative target line used to shift the orientation of fires
  to assure all likely threat avenues of ingress are adequately defended. Secondary target lines are
  designated to supplement the effects of an ADA unit to defend adjoining areas on both sides of the primary
  target line. These sectors of fire are clearly defined by right and left boundaries. The assignment of primary
  and secondary target lines for Patriot, which has a sectored radar, is critical to mission success. However,
  THAAD, which also has a sectored radar, does not plan for or assign secondary target lines. Other sensors,
  such as Sentinel, provide 360-degree coverage; assignment of secondary target lines are less critical but do
  enable operators to concentrate attention within assigned sectors based upon likely enemy air avenues of
  approach.
  2-38. A summary of the key engagement operations tasks is presented in table 2-2. The tasks are
  representative (not inclusive) of those that are conducted by Patriot, THAAD, and SHORAD fire units. See
  the echelon chapters for additional discussions of engagement operations.
  Table 2-2. AMD engagement tasks
  AMD Engagement Tasks
  2-10 FM 3-01 22 December 2020
  etucexE
   Detect aerial objects.
   Classify/discriminate/identify aerial objects.
   Determine appropriate weapon system to conduct the engagement.
   Determine impact area.
   Clear the target area.
   Order the engagement.
   Conduct the engagement in accordance with the control measures.
  ssessA
   Monitor and assess the engagement.
   Reengage as necessary.
   Update air and missile defense tactical orders and reports as necessary.