text: Chapter 2
  Table 2–1. Command relationships, continued
  ADCON-administrative control HQ-headquarters
  AO-area of operations N/A-not applicable
  ASCC-Army Service component command NATO-North Atlantic Treaty Organization
  DS-direct support OPCON-operational control
  GS-general support R-reinforcing
  GSR-general support–reinforcing TACON-tactical control
  GU-gaining unit
  ORGANIC
  2-73. Organic forces form an essential part of a military organization as a part of its design. A CAB has
  five battalions, plus a headquarters company organic to it. If, for example, the AB is task-organized under a
  brigade combat team (BCT) headquarters for a temporary mission, it would return to the control of the
  CAB upon completion.
  ASSIGNED
  2-74. Subordinates are assigned in order to place units or personnel in an organization where such
  placement is relatively permanent, and/or where such organization controls or administers the unit or
  personnel for the primary functions of the unit. Due to sustainment, standardization, and safety
  requirements, aviation battalions or ASTFs/ABTFs typically remain assigned to their parent CAB. This
  relationship includes administrative control unless specifically stated otherwise.
  ATTACHED
  2-75. Subordinates are attached when the placement of units or personnel in an organization is relatively
  temporary. The commander of the unit that receives the attachment is responsible for the sustainment and
  logistical support that is beyond the capability of the attached unit. An example of this relationship is an
  aviation maneuver company attached to a sister aviation battalion to form an ASTF/ABTF. The gaining
  headquarters normally assumes administrative control requirements, particularly sustainment unless stated
  otherwise.
  OPERATIONAL CONTROL
  2-76. OPCON is a command relationship that gives a commander authority over subordinate forces to
  organize and employ those forces, designate objectives, assign tasks, and give direction regarding
  accomplishment of the mission. The commander exercising OPCON authority has no responsibility for
  logistical sustainment of the supporting unit. A CAB may place an ABTF or company-sized unit OPCON
  to a ground force for a specific mission requirement, usually of limited and short duration where no
  enduring sustainment is required.
  TACTICAL CONTROL
  2-77. TACON is a command relationship that gives a commander authority over assigned or attached
  forces or commands, or military capability or forces made available for tasking, which is limited to and is
  usually local direction and control of movements or maneuvers necessary to accomplish assigned missions.
  Notably, only the parent unit may further task-organize a unit that has been assigned TACON to another
  headquarters. The CAB frequently employs TACON during stability operations for short duration
  operations requiring a high degree of AGO, such as area security or air assaults.