text: Chapter 2
  When task-organized with an AB/ACS, ECABs also provide accurate and timely information collection,
  provide reaction time and maneuver space, and destroy, defeat, disrupt, or delay enemy forces. The ECAB
  is an ARNG or United States Army Reserve (USAR) organization.
  ORGANIZATION
  2-16. The ECAB consists of an HHC, two AHBs, a GSAB, and an ASB. Figure 2-3 provides ECAB
  organization.
  Figure 2–3. Expeditionary combat aviation brigade
  CAPABILITIES
  2-17. The ECAB is designed to be modular and tailorable, and is typically task-organized as required to
  support offensive, defensive, and stability operations in support of ground maneuver forces or during
  DSCA. The ECAB is designed to split into three maneuver battalions or battalion task forces, and one
  ASB, based on mission variables. The ECAB receives up to two additional ASTFs/ABTFs without staff
  augmentation but requires additional maintenance personnel and equipment. The ECAB performs the
  following tasks:
  * Air assault.
  * Aerial C2.
  * Air movement.
  * AE.
  * Aerial CASEVAC.
  * PR.
  * Aerial-delivered mine operations.
  2-18. When the ECAB is augmented with attack or reconnaissance units, its capabilities are increased.
  Appropriate training time, staff, maintenance, and logistics support are critical in the development of these
  capabilities prior to conducting operations. When augmented, the ECAB may perform the following
  additional tasks:
  * Movement to contact.
  * Attack.
  * Reconnaissance.
  * Security.
  THEATER AVIATION BRIGADE
  2-19. The TAB-GS provides accurate and timely reconnaissance; positions personnel, supplies, and
  equipment; evacuates casualties; conducts search and rescue; and enables C2 during DSCA operations. The
  TAB-GS is an ARNG or USAR organization.
  2-20. The TAB-A 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 PR;
  and enable C2. The TAB-A is an ARNG organization.