text: Chapter 3
  ▪ Provide Army support to other Services.
  ▪ Conduct theater security cooperation.
  ▪ Assess and develop infrastructure.
  ▪ Develop concept and operation plans.
  • Setting and maintaining the theater.
  • Setting and supporting operational areas:
  ▪ Conduct RSOI.
  ▪ Provide sustainment support in an operational area.
  THEATER SUSTAINMENT COMMAND
  3-104. The TSC concentrates on strategic and operational-level sustainment support and management. When
  directed, the TSC provides lead service sustainment and executive agency support for designated logistics
  and services to other government agencies, multinational forces, and nongovernmental organizations. The
  TSC has four operational responsibilities to forces in theater:
  • Theater opening – The ability to establish and operate ports of debarkation (air, sea, and rail), to
  establish a distribution system and sustainment bases, and to facilitate throughput for reception,
  staging, and onward movement of forces within a theater of operations (ADP 4-0).
  • Theater distribution – The flow of personnel, equipment, and materiel within theater to meet the
  geographic combatant commander’s mission (JP 4-09).
  • Sustainment – The provision of logistics, financial management, personnel services, and health
  service support necessary to maintain operations until successful mission completion (ADP 4-0).
  • Theater closing – The process of redeploying Army forces and equipment from a theater, the
  drawdown and removal or disposition of Army non-unit equipment and materiel, and the transition
  of materiel and facilities back to host nation or civil authorities (ADP 4-0).
  3-105. The TSC simultaneously plans and synchronizes sustainment operations for theater security
  cooperation activities (which include security assistance, joint and multinational exercises, security force
  assistance, civil-military operations) and large-scale combat operations.
  3-106. The theater petroleum and water group, normally attached to the TSC, operates within the AOR for
  distribution of petroleum in the theater. Embedded within the theater Army are staff elements which provide
  oversight of petroleum and water supply, storage, reporting, and health safety within the AOR. The G-3 is
  responsible for developing the theater Army concept of operations, which will drive fuel requirements. The
  G-4 staff is the primary staff concerned with petroleum and water requirements determination.
  3-107. The Theater Petroleum Center or petroleum liaison detachments may be assigned or attached to the
  theater Army G-4 to support planning and operations at the theater level. The Theater Petroleum Center
  serves as the senior Army petroleum advisor to the CCMDs. It provides strategic through operational
  planning support to CCMDs, the theater Army, corps, and TSC. It also conducts liaison support with DLA
  Energy, the Army Petroleum Center, the joint petroleum office, subarea petroleum office, and other partners
  as needed. For additional information, see ATP 4-43.
  3-108. Planners use the understanding of an OE and situational understanding developed during the execution
  of shaping activities to develop and refine OPLANs as conditions change in various operational areas. For
  example, a TSC review of an OPLAN could reveal that a planned port or designated supply route is
  inadequate for large-scale combat operations. The TSC forwards a recommended alternative to the ASCC
  headquarters.
  3-109. The ASCC G-1 is the senior Army HR representative/advisor in the theater. The G-1’s primary
  function is to plan and prioritize HR support to assure a unity of purpose and effort that maximizes the
  readiness and operational capabilities of forces within the theater. The TSC ensures HR organizations
  (military mail terminal, TG PAT, HR company) execute their HR missions in accordance with the policies,
  priorities, and timelines established by the ASCC G-1/AG. Refer to FM 1-0 for specific roles and
  responsibilities.
  3-110. The TSC G-8 is the senior resource management adviser to the TSC commander. The TSC G-8’s
  focus is on TSC-specific (internal) resource management support, which is identifying, acquiring,