text: Army Health System Command and Control
  ARMY COMMAND AND SUPPORT RELATIONSHIPS
  2-5. Army command and support relationships are similar but not identical to joint command authorities
  and relationships. Differences stem from the way Army forces task-organize internally and the need for a
  system of support relationships between Army forces. Another important difference is the requirement for
  Army commanders to handle the administrative support requirements that meet the needs of Soldiers. These
  differences allow for flexible allocation of Army capabilities within various Army echelons. Army command
  and support relationships are the basis for building Army task organizations. Certain responsibilities are
  inherent in the Army's command and support relationships. For more information on command relationships
  for joint force, refer to JP 3-0.
  ARMY COMMAND RELATIONSHIPS
  2-6. Commanders recognize that effectiveness is built on mutual trust and confidence between superior,
  subordinate, supporting and supported organizations. This trust and confidence is developed through
  relationships. Generally the longer a relationship lasts, a greater degree of trust and confidence results.
  Between organizations that have had long-term habitual relationships, authorities and responsibilities are
  typically well known. For more information regarding mission command and command and control of Army
  forces, refer to ADP 6-0 and FM 6-0.
  2-7. Army command relationships define superior and subordinate relationships between unit commanders.
  By specifying a chain of command, command relationships unify effort and enable commanders to use
  subordinate forces with maximum flexibility. Army command relationships identify the degree of control of
  the gaining Army commander. The type of command relationship often relates to the expected longevity of
  the relationship between the headquarters involved, and it quickly identifies the degree of support that the
  gaining and losing Army commanders provide. The five Army command relationships include:
  * Organic.
  * Assigned.
  * Attached.
  * Operational Control (OPCON).
  * Tactical control (TACON).
  2-8. See Appendix B for more information regarding Army command relationships according to FM 3-0
  and FM 4-0.
  ARMY SUPPORT RELATIONSHIPS
  2-9. Army support relationships are not a command authority and are more specific than joint support
  relationships. Commanders establish support relationships when subordination of one unit to another is
  inappropriate. Army support relationships are:
  * Direct support.
  * General support.
  * Reinforcing.
  * General support-reinforcing.
  2-10. Refer to Appendix B for more information on Army support relationships according to FM 3-0 and
  FM 4-0.
  2-11. See Figure 2-2 on page 2-4 for an example of AHS organizations’ command and support relationships
  during an operation or when deployed. Refer to Appendix C for more information on the synchronization,
  coordination, and integration of medical support at echelon between medical and sustainment (FM 4-0),
  protection, and other warfighting functions/staff cells.