text: Chapter 6
  Note. Understanding command and support relationships is important for the MI unit commander
  subordinating one unit to another, as appropriate.
  COMMAND RELATIONSHIPS
  6-58. Command relationships are used when the most responsive employment of augmenting MI units is
  required. Army command relationships are designated as either organic, assigned, attached, OPCON, or
  tactical control (TACON). Each relationship has inherent responsibilities associated with it. (See table 6-1.)
  All relationships, other than assigned, temporarily associate the augmenting MI unit with the gaining unit.
  Augmenting units return to their MI parent unit at the end of the operation, as specified in the plan or order
  directing the relationship, or when directed by a FRAGORD.
  Table 6-1. Army command relationships
  Then the following are inherent responsibilities:
  Authorities
  CDR can
  Unless
  Are impose on
  If the Have May be modified, Establish and Have
  assigned Provide gaining unit
  relationship command task- ADCON maintain priorities
  position liaison further
  is— relationship organized responsibility communications established
  or AO to— command or
  with— by— goes with— by—
  by— support
  through—
  relationship
  of—
  Attached;
  Organic Organic Organic OPCON;
  Organic Organic HQ N/A N/A Organic HQ
  HQ HQ HQ TACON; GS,
  GSR, R, DS
  Attached;
  Gaining Gaining Gaining OPCON;
  Assigned Gaining HQ N/A N/A Gaining HQ
  HQ HQ HQ TACON; GS,
  GSR, R, DS
  As
  required OPCON;
  Gaining Gaining Gaining Unit to which
  Attached Gaining HQ by Gaining HQ TACON; GS;
  HQ HQ HQ attached
  gaining GSR; R; DS
  HQ
  Parent unit
  and gaining As
  unit; required As required by OPCON;
  Gaining Gaining
  OPCON gaining unit Parent HQ by gaining HQ and Gaining HQ TACON; GS;
  HQ HQ
  may pass gaining parent HQ GSR; R; DS
  OPCON to HQ
  lower HQ
  As
  required As required by
  Gaining Gaining TACON; GS;
  TACON Parent HQ Parent HQ by gaining unit and Gaining HQ
  HQ HQ GSR; R; DS
  gaining parent HQ
  HQ
  ADCON administrative control HQ headquarters
  AO area of operations N/A not applicable
  CDR commander OPCON operational control
  DS direct support R reinforcing
  GS general support TACON tactical control
  GSR general support-reinforcing
  6-59. OPCON normally provides full authority to task-organize augmenting commands and forces and to
  employ those forces as the gaining commander considers necessary. It does not, in and of itself, include
  authoritative direction for logistics or matters of administration, discipline, internal organization, or unit
  training. A significant consideration in the OPCON relationship is that sustainment and other administrative
  control (ADCON) responsibilities remain with the parent MI unit unless the plan or order directing the
  relationship specifies otherwise. Normally, modifications to the inherent responsibilities are directed in the
  Tasks to Subordinate Units subparagraph of paragraph 3 (Execution) of the order.