text: Appendix B
  OPERATIONAL AND TACTICAL CONTROL
  B-13. For discussion on OPCON and TACON, refer to joint command relationship above.
  ARMY SUPPORT RELATIONSHIPS
  B-14. Table B-2 (page B-5) lists Army support relationships. As discussed in Chapter 2, the Army support
  relationships are-
  * Direct support.
  * General support.
  * Reinforcing.
  * General support-reinforcing.
  B-15. Commanders assign a support relationship for several reasons. They include when-
  * The support is more effective if a commander with the requisite technical and tactical expertise
  controls the supporting unit rather than the supported commander.
  * The echelon of the supporting unit is the same as or higher than that of the supported unit. For
  example, the supporting unit may be a brigade, and the supported unit may be a battalion. It would
  be inappropriate for the brigade to be subordinated to the battalion; hence, the echelon uses an
  Army support relationship.
  * The supporting unit supports several units simultaneously. The requirement to set support
  priorities to allocate resources to supported units exists. Assigning support relationships is one
  aspect of mission command.
  B-16. Army support relationships allow supporting commanders to employ their units' capabilities to achieve
  results required by supported commanders. Support relationships are graduated from an exclusive supported
  and supporting relationship between two units-as in direct support-to a broad level of support extended to all
  units under the control of the higher headquarters-as in general support. Support relationships do not alter
  administrative control. Commanders specify and change support relationships through task organization.
  B-17. Direct support is a support relationship requiring a force to support another specific force and
  authorizing it to answer directly to the supported force's request for assistance. A unit assigned a direct
  support relationship retains its command relationship with its parent unit, but it is positioned by and has
  priorities of support established by the supported unit. (Joint doctrine considers direct support a mission
  rather than a support relationship.) A field artillery unit in direct support of a maneuver unit is concerned
  primarily with the fire support needs of only that unit. The fires cell of the supported maneuver unit plans
  and coordinates fires to support the maneuver commander's intent. The commander of a unit in direct support
  recommends position areas and coordinates for movement clearances where the unit can best support the
  maneuver commander's concept of the operation.
  B-18. General support is that support which is given to the supported force as a whole. It is not given to any
  particular subdivision of the force. Units assigned a general support relationship are positioned and have
  priorities established by their parent unit. A field artillery unit assigned in general support of a force has all
  of its fires under the immediate control of the supported commander or the designated force field artillery
  headquarters.
  B-19. Reinforcing is a support relationship requiring a force to support another supporting unit. Only like
  units (for example, artillery to artillery) can be given a reinforcing mission. A unit assigned a reinforcing
  support relationship retains its command relationship with its parent unit, but it is positioned by the reinforced
  unit. A unit that is reinforcing has priorities of support established by the reinforced unit, then the parent
  unit. For example, when a direct support field artillery battalion requires more fires to meet maneuver force
  requirements, another field artillery battalion may be directed to reinforce the direct support battalion.