text: Large-Scale Combat Operations
  4-14. Large command post communications systems lack the mobility required during tactical enabling
  tasks. When executing tactical enabling tasks beyond the range of VHF single-channel radios, or when terrain
  prevents line of sight communications, units can employ retransmission capabilities, single-channel HF
  radios, narrowband (single-channel) tactical satellite radios, tactical messaging, or secure satellite telephones
  for communications between units and command posts.
  4-15. Employing a retransmission site requires deliberate mission planning before deploying the team.
  Planning factors for retransmission include—
  * Units supported.
  * Planned retransmission locations throughout the mission, including alternates, with line of sight
  analysis.
  * Triggers for displacement to alternate locations.
  * Primary and alternate frequencies.
  * Frequencies for emergency contact—
   Medical evacuation.
   Command.
   Nearest units.
  * Time required to be on station and retransmitting for supported units.
  * Route and site security requirements.
  * Infiltration and exfiltration routes.
  * Whether unmanned aircraft systems or other aerial retransmission capabilities can meet the
  requirement.
  * Plan to communicate with the parent unit (for example, contact the higher unit every two hours
  with update).
  * Resupply plan.
  * Concealment of the site.
  * Plans to mask or reduce the electromagnetic signature of the site.
  4-16. Passage of lines is generally considered a higher-risk operation. The division may establish a command
  and control node such as a tactical command post at the passage point to enable communications between
  passing units and their higher headquarters.
  4-17. Relief in place operations require greater access to networked DODIN-A services than other maneuver
  tasks. Relief in place involves detailed planning and coordination between the current unit and the relief unit.
  The handover plan identify which communications systems rotate out with the departing unit and how to
  migrate services to the gaining unit’s systems. The gaining unit generally retains the frequency allocations
  of the relieved unit, but deploys with its own allocated Internet protocol address range for its network and
  automated information systems.
  SIGNAL SUPPORT TO FORCIBLE ENTRY OPERATIONS
  4-18. Army signal forces must be capable of providing communications support from the point of departure,
  in transit, during landing, and throughout the fight to gain access to the geographic area controlled by hostile
  forces. Commanders and staffs must understand what communications capabilities and services will be
  available during each phase of the operation. Plans include the transition to more robust communications
  capabilities as they arrive in the area of operations. For example, during an airborne operation to seize an
  airfield, the aircraft may be fitted with wideband satellite communications capabilities to access video,
  imagery, databases, and e-mail while en route. During the airborne assault, communications are limited to
  single-channel radios. As the unit begins to consolidate gains, a small communications node may provide the
  commander, S-3, and S-2 with wideband satellite access to the DODIN-A. Once aircraft can land, the
  command receives and establishes its organic signal capabilities to support command post operations with
  wide-area network access.