text: Chapter 5
  5-55. During joint operations sustainment is a Service responsibility except as specified by executive agency
  requirements, DOD directives, CCDRs’ lead Service designations, or inter-Service support agreements.
  CCDRs direct theater army commanders to provide Army support to other Services (ASOS) to agencies or
  multinational forces when required. However, shared sustainment responsibility or common-user logistics is
  more effective, especially for joint operations. Directive authority for logistics is the additional authority
  available to CCDRs to eliminate duplicative or overlapping sustainment responsibilities. The theater army
  coordinates with the combatant command staff to determine joint sustainment requirements, identify
  responsibilities, and enable commanders to exercise sustainment C2. (See ATP 3-93 for additional details on
  the theater army.)
  CORPS ROLES DURING CRISIS
  5-56. During crisis, the corps headquarters may deploy into an operational area as a tactical headquarters
  with subordinate divisions and brigades. Corps typically deploy an early entry command post, comprising
  selected personnel from within the headquarters, to provide C2 of arriving forces. Should crisis become
  armed conflict, large-scale combat operations may require the corps headquarters to function under the
  command of a multinational force land component or become subordinate to a field army equivalent
  established as part of a multinational coalition.
  5-57. Corps headquarters plan for all phases of an operation from mobilization to redeployment. Corps
  operations require planners to consider all functions and capabilities required to gain and maintain positions
  of relative advantage and the capabilities threat forces can use against friendly forces. Understanding the
  planning and execution timelines of various capabilities is critical when considering the integration of those
  capabilities into the overall plan. The corps headquarters is responsible for—
  (cid:122) Understanding the threat.
  (cid:122) Integrating information collection and intelligence analysis into the next higher echelon’s
  processes and systems.
  (cid:122) Establishing liaison with its higher headquarters and planning reconnaissance of its initial
  assembly areas, routes, and forward assembly areas.
  (cid:122) Assigning subordinate units areas of operations.
  (cid:122) Identifying multiple routes from the points of debarkation through assembly areas to staging areas.
  (cid:122) Establishing an initial concept of operations.
  (cid:122) Planning to consolidate gains.
  (cid:122) Coordinating cyberspace attack mitigation, including distributed denial of service, malicious
  software, or system intrusion.
  (cid:122) Planning and preparing for communication denial and degradation.
  (cid:122) Planning for dispersion of subordinate units along routes and within assembly areas.
  5-58. Per the deployment order and operation plan (OPLAN) or operation order, the corps staff plans task
  organization and employment of subordinate units, integration and synchronization of operations, massing
  of effects, allocation of resources, and determination of priorities. The corps staff provides the primary Army
  interface to manage the time-phased force and deployment list for all its assigned forces. The corps
  determines when its command posts will arrive at a port of debarkation in relation to the arrival of protection,
  sustainment, and maneuver units.
  5-59. A corps commander can influence, but not dictate, the tailoring of subordinate units. The CCDR,
  theater army, supporting combatant commands, U.S. Transportation Command, and U.S. Army Forces
  Command all make decisions concerning the composition and deployment sequence of the corps. A corps
  commander can, however, organize and prepare the corps command posts for efficient and effective
  movement throughout a deployment. By selecting personnel with the right skill sets and providing them the
  right mix of equipment, the commander, chief of staff, and assistant chief of staff, operations, match corps
  C2 capabilities with mission requirements.
  5-60. Assigning initial staging areas, movement routes, and subsequent assembly areas in uncertain threat
  conditions requires a calculated balance between force protection and building combat power. Staging areas
  for subordinate division and separate brigade elements should be large enough for divisions and separate