text: Chapter 3
  Expeditionary Sustainment Command
  3-58. The ESC is the expeditionary command for joint logistics. Normally, the ESC is assigned to a corps;
  however, the theater army may task-organize to another formation based upon the requirements of the
  operation. The ESC, when assigned as a subordinate element of the TSC, supports the deployed force while
  the TSC maintains AOR-wide focus. The ESC concentrates on synchronizing operational-level sustaining
  operations to meet the day-to-day and projected operational requirements of the supported force. It
  accomplishes this, in part, by establishing mid-range and short-range planning horizons derived from the
  supported commanders operation plan, commander‘s intent, commander’s critical information requirements,
  tempo, and distribution system capacity. The expeditionary capability of ESCs becomes critical when
  multiple JTFs operate in an AOR.
  3-59. The ESC commands attached sustainment units in a land AO defined by the JFC. The ESC extends the
  ability of the TSC to manage logistics, finance operations, and personnel support by becoming the
  forward-deployed sustainment headquarters in the JOA. Additional ESCs may be attached to the TSC if the
  combatant commander establishes a JSA or staging base. Depending on the command structure in the theater,
  ESCs may support specific Army forces in a JOA or support other ESCs and sustainment brigades with
  theater opening or theater distribution capabilities. (See ADP 4-0 and FM 4-0 for additional information).
  Signal Command (Theater)
  3-60. The signal command (theater) provides Department of Defense information network (DODIN)
  operations capabilities to support Army, joint, and multinational forces in theater through its associated
  regional cyber center. These capabilities use the Department of Defense information network-Army
  (DODIN-A) for network extension and reach back to support the GCC. In coordination with the regional
  cyber center, the signal command (theater) operates Army networks in the theater and delivers common user
  services to support the GCC and the theater army. With joint augmentation, the signal command (theater)
  may also assume joint or multinational DODIN operations responsibility for a JTF. As the theater’s senior
  Army signal commander, the signal command (theater) commander may be designated to serve as the
  communications system directorate of a joint staff (known as J-6) of an Army-led JTF or the ARFOR chief
  of staff, signal (G-6).
  Note. In a theater with no assigned signal command (theater), Network Enterprise Technology
  Command has a staff organization called the tactical actions center that assumes many of the
  engineering and oversight roles formerly performed by the signal command (theater).
  Theater Strategic Signal Brigade or Strategic Signal Brigade
  3-61. The theater strategic signal brigade or strategic signal brigade provides operational and strategic
  support area signal support to serve warfighters in a theater of operations. This support includes long-haul
  transport, communications infrastructure, automation, and network management. Each theater strategic
  signal brigade or strategic signal brigade is unique and tailored to support unique communications
  infrastructure requirements of its theater. The theater strategic signal brigade commands multiple subordinate
  strategic signal battalions and activities with different capabilities that assist in providing theater
  communications. The strategic signal brigade is assigned to the United States Army Network Enterprise
  Technology Command. (See FM 6-02 for more information on signal support.)
  3-62. The theater strategic signal brigade or strategic signal brigade has one or more assigned theater network
  operations and security regional cyber centers that serve as the operational component of network operations.
  These centers provide a single point of contact for Army network services, operational status, service
  provisioning, service interruption resolution, and service restoration in their operational area. The theater
  network operations and security regional cyber centers are OPCON to the United States Army Information
  Warfare Command for day-to-day defense of the Army’s portion of the DODIN-A. (See FM 6-02 for more
  information on network operations. See ATP 6-02.71 for more information about the regional cyber center.)
  3-63. The strategic signal brigade or theater signal brigade based in the United States includes network
  enterprise centers (also known as NECs). When stationed outside the continental United States, a theater