text: Army Aviation Organizations and Command and Control
  between the unit, its new headquarters, and its parent unit. Typically, the smallest element Army Aviation
  detaches is a company-sized element with the exception of air ambulance units, which typically operate at
  the platoon level. However, elements as small as platoons, teams, and even individual aircraft may be
  cross-attached from one aviation formation to another.
  COMMAND RELATIONSHIPS
  2-72. Command relationships specify superior and subordinate headquarters responsibilities. The type of
  command relationship selected corresponds to the duration of the mission and it serves to clarify duties of
  gaining and losing headquarters. Table 2-1 provides more information on command relationships. Refer to
  FM 3-0 for additional information.
  Table 2–1. Command relationships
  Then inherent responsibilities:
  If
  relation-
  ship is—
  All Can impose
  Establish
  Have organic Organic Are Provide Have on gained
  and
  command forces HQ assigned liaison priorities unit further
  relation- organize position to— maintain establish- command or
  communi-
  ship d with or AO ed by— support
  cations
  with— the HQ by— relationship
  with—
  of—
  Organic Army HQ Organic N/A N/A Organic Attached;
  specified HQ HQ OPCON;
  in TACON;
  organizin GS; GSR;
  g R; DS
  document
  As As ASCC or
  OPCON As required
  Gaining Gainin Gaining required required Service-
  Assigned chain of by OPCON
  unit g HQ Army by by assigned
  command HQ
  HQ OPCON OPCON HQ
  Attached Gaining Gaining Gaining Gaining As Unit to Gaining Attached;
  unit unit Army HQ unit require which unit OPCON;
  d by attached TACON;
  GU GS; GSR;
  R; DS
  OPCON Gaining Parent Parent Gaining As As Gaining OPCON;
  unit unit and unit unit require required unit TACON;
  GU; GU d by by GU GS; GSR;
  may GU and R; DS
  pass parent
  OPCON unit
  to lower
  HQ1
  TACON Gaining Parent Parent Gaining As As Gaining TACON;GS
  unit unit unit unit require required unit GSR; R;
  d by by GU DS
  GU and
  parent
  unit
  Note. 1 In NATO, the gaining unit may not task-organize a multinational force. (See TACON. )