text: Armies
  Figure 3-3. Example of expanded theater
  Theater Aviation Brigade
  3-75. Theater aviation is an Army aviation brigade. Each theater aviation brigade can conduct assault or
  general support aviation tasks in support of the theater and its subordinate commands. The theater aviation
  brigade comes in a general support variant and an assault variant. The theater aviation brigade general support
  provides accurate and timely reconnaissance in permissive environments; positions personnel, supplies, and
  equipment; evacuates casualties; conducts search and rescue; and enables command and control in defense
  support of civil authorities operations. The theater aviation brigade assault augments other aviation brigades
  or operates autonomously at the theater level to air assault maneuver forces; position personnel, supplies, and
  equipment; evacuate casualties and conduct personnel recovery; and enable command and control.
  3-76. Unlike combat aviation brigades, a theater aviation brigade lacks attack and reconnaissance battalions.
  The theater aviation brigade has a mix of lift helicopters and fixed-wing aircraft. The brigade can conduct air
  assault, air movement, and sustaining operations. It will normally not have attached unmanned aircraft
  systems. The theater aviation brigade reinforces combat aviation brigades with additional assault, general
  support, heavy lift, and aeromedical evacuation. It can fly fixed-wing sorties in support of the ARFOR,
  theater army, and JFC. (See FM 3-04 for more information on the theater aviation brigade.)
  Theater Airfield Operations Group
  3-77. Army air traffic service units at the theater level consist of the theater airfield operations group with
  its subordinate airfield operations battalions. These units establish and operate airfields as needed in an AOR.
  Advanced operations bases can operate a fully instrumented airfield with airport surveillance radar approach,
  precision approach radar, and controlling airspace necessary to support airfield operations.
  3-78. The theater airfield operations group and its subordinate Army air traffic service organizations are an
  enabling component of the Army aviation force and can support forcible and early entry contingency missions
  and sustained theater aviation operations. Air traffic operations are conducted overseas in contiguous and
  noncontiguous areas throughout the range of military operations. (See FM 3-04 for more information on the
  theater airfield operation group.)
  Theater Aviation Sustainment Maintenance Group
  3-79. The theater aviation maintenance sustainment group is resourced to provide aviation sustainment
  maintenance and limited depot sustainment support at the theater level. The theater aviation maintenance