text: Appendix B
  OTHER RELATIONSHIPS
  B-29. Several other relationships established by higher echelon headquarters exist with units that are not in
  command or support relationships. These relationships are limited or specialized to a greater degree than the
  command and support relationships, and they may be detailed in a command’s implementing directives.
  These limited relationships are not used when tailoring or task-organizing Army forces. Use of these
  specialized relationships helps clarify certain aspects of OPCON or ADCON. (See table B-4 for a listing of
  other relationships.)
  Table B-4. Other relationships
  Relationship Operational use Established by Authority and limitations
  TRO TRO is an authority The CCDR identified TRO allows the CCDR to provide
  exercised by a in the “Forces for guidance on operational
  combatant commander Unified Commands” requirements and training priorities,
  over assigned RC memorandum. The review readiness reports, and
  forces not on active CCDR normally review mobilization plans for RC
  duty. Through TRO, delegates TRO to forces. TRO is not a command
  CCDRs shape RC the ASCC. relationship. ARNG forces remain
  training and readiness. under the command and control of
  Upon mobilization of their respective State Adjutant
  the RC forces, TRO is Generals until mobilized for Federal
  no longer applicable. service. USAR forces remain under
  the command and control of the CG,
  USARC until mobilized.
  TRA TRA is an authority for Higher commander. TRA includes responsibility for all
  a designated facets of command that enable
  commander to give commanders to accomplish their
  direction to an mission. It does not include those
  attached unit for leader installation command authorities
  development, vested in the Army Senior
  individual and Commander.
  collective training, and
  unit readiness.
  DIRLAUTH Allows planning and The parent unit Limited to planning and coordination
  direct collaboration headquarters. This is between units.
  Note. See also between two units a coordination
  paragraph B-16. assigned to different relationship, not an
  commands, often authority through
  based on anticipated which command may
  tailoring and task be exercised.
  organization changes
  Aligned Informal relationship to Theater army and Normally establishes information
  facilitate planning parent command. channels for coordination between
  between a theater the gaining theater army and Army
  army and other Army units that are likely to be committed
  units identified in to that area of responsibility.
  operations and
  exercises in a specific
  combatant command.
  ASCC Army Service component command RC Reserve Component
  ARNG Army National Guard TRO training and readiness oversight
  CCDR combatant commander USAR United States Army Reserve
  CG commanding general USARC United States Army Reserve Command
  DIRLAUTH direct liaison authorized