text: Army Sustainment at Echelon
  SPECIAL FORCES – GROUP SUPPORT BATTALION
  2-78. The GSB is the primary sustainment provider in a special forces group. Its mission is to plan,
  coordinate, synchronize, and execute sustainment operations such as the SSA, weapons and electronics
  maintenance, strategic mobility, and consolidated aerial delivery and rigging operations in support of a
  special forces group when it is acting as the joint special operations task force. Due to the unique employment
  characteristics of ARSOF units, the GSB habitually does not deploy in its entirety as there is only one in each
  special forces group. The GSB must simultaneously support the operations of each battalion, receiving
  support from conventional forces as required.
  2-79. When ASCC logistics support is unavailable or not established in an operational area, the GSB will be
  the primary CUL provider. The GSB can function as a combined and joint headquarters, integrating partner-
  nation and sister-Service elements. However, no single support battalion can cover the geographical
  dispersion without conventional force logistics support. The GSB coordinates with conventional force
  sustainment brigades, division sustainment brigades (DSBs), the ESC, and the TSC to enable an area support
  concept for each special operations task force, advanced operations base, and special forces operational
  detachment alpha. Area support enables SOF elements in the vicinity of conventional force bases to receive
  general sustainment support. See FM 3-05 for additional information.
  RANGER SUPPORT COMPANY
  2-80. The Ranger support companies are reliant on the Ranger Regiment S-4 section and Ranger support
  operations detachment for planning and coordination. The Ranger support company is multifunctional and
  organic to each battalion within the Ranger Regiment. Ranger support companies provide field maintenance,
  supply support, water production (with limited distribution), transportation, aerial delivery, property
  management, limited chemical, biological, radiological, and nuclear (CBRN) decontamination and
  reconnaissance, and food service. See ATP 3-05.40 for additional information.
  SECTION IV – OVERVIEW OF OPERATIONAL LEVEL OF WARFARE
  2-81. The operational level of warfare is the level of warfare in which campaigns and operations are planned,
  conducted, and sustained to achieve operational objectives to support achievement of strategic objectives (JP
  3-0). The operational level links the employment of tactical forces to the achievement of strategic objectives.
  2-82. The operational level of warfare is generally the realm of CCMDs and their Service or functional
  components, and subordinate JTF headquarters and their Service or functional components. This includes the
  theater Army headquarters as the Army Service component to a CCMD and any other echelon operating as
  an ARFOR, JTF headquarters, or land component command.
  FIELD ARMY
  2-83. When constituted, the field army’s role is to serve as the ARFOR in a subordinate AO. Army doctrine
  distinguishes between the ARFOR of a CCMD and that of a joint force formed by the CCDR. The ASCC of
  the CCMD is the ARFOR for the theater and the Army component of the subordinate joint force, the field
  army is the ARFOR for multi-corps operations in the subordinate AO. The ASCC maintains control of all
  Army units in an AOR until such time that control is passed to the field army. As part of controlling Army
  forces, the ARFOR maintains ADCON of Army forces and addresses Service responsibilities such as
  coordinating Army support to other Services. An ESC may be attached to a field army to control the
  integration and synchronization of sustainment to support field army operations. When attached to the field
  army, the ESC provides sustainment support to units identified in the field army task organization in
  accordance with the priorities established by the field army commander. See FM 3-94 and ATP 4-92 for
  additional information on field armies.
  SUSTAINMENT BRIGADE
  2-84. The sustainment brigade plans, synchronizes, and executes sustainment operations across the theater
  Army, corps, and division echelons. The sustainment brigade is the Army’s primary brigade-level
  sustainment headquarters providing command and control for assigned, attached, and OPCON sustainment
  units. Sustainment brigades are typically assigned or attached to a TSC, ESC, or division and have a span of