text: Appendix B
  Figure B-1. Possible joint task force components
  ARFOR RESPONSIBILITIES
  B-6. The theater army provides sustainment to all Army forces stationed in, transiting through, or operating
  in an AOR. It also provides most ASOS, common-user logistics, and Army executive agent support to unified
  action partners in an AO. The theater army executes these sustainment responsibilities through its assigned
  TSC. (See Chapter 3 for a detailed discussion of the theater army.)
  B-7. The ARFOR in a subordinate joint force provides administrative and logistics support to all Army
  forces and retains OPCON over Army units not subordinate to another component of the JTF. Since the
  preferred approach to establishing a JTF headquarters is use of an existing Service headquarters, the JTF
  commander (if an Army headquarters) retains all responsibilities associated with both headquarters (the
  ARFOR and JTF). This can overload the JTF headquarters unless the commander delegates authority for
  Service-specific matters to another commander. For example, when a corps headquarters transitions to a JTF
  headquarters, the corps commander becomes the JTF commander. The corps retains ARFOR responsibilities
  through the ASCC back to the Army, unless the corps commander shifts Service responsibilities to another
  headquarters. The corps commander normally designates a subordinate Army commander and staff as the
  deputy ARFOR commander to perform those duties.
  Note. Generally, an Army headquarters that transitions to a JTF headquarters designates a
  subordinate Army commander and staff as the deputy ARFOR commander for performing
  ARFOR duties.