text: Armies
  Conduct Theater Security Cooperation
  3-23. GCCs shape their regions through many cooperative actions with partner nations. The theater army
  executes theater security cooperation through exercise programs, military-to-military engagement, providing
  equipment, training, and financial assistance that the United States provides to partner nations to improve
  their abilities to secure themselves. Security cooperation communicates U.S. intent and capabilities to
  potential adversaries in that region. This assistance often improves access to key regions. These are tangible
  effects of the Army’s role in security cooperation and assistance. Other benefits are less tangible; these
  develop through face-to-face training involving U.S. Soldiers and the soldiers of partner nations. The
  impression U.S. Soldiers make upon multinational forces, local leaders, and other government agencies can
  produce lasting benefits and trust. (See FM 3-34, ATP 3-34.40, and ATP 3-37.10 for more information on
  shaping and security cooperation.)
  Assess and Develop Infrastructure
  3-24. Infrastructure is essential to ensuring effective operations in theater and executing many of the
  combatant commander’s daily operational requirements. The theater army and its supporting commands
  assess the adequacy of infrastructure in the AOR to support anticipated military operations, determine
  requirements for additional infrastructure, and manage infrastructure development programs assigned to
  Army forces for execution. The theater army develops these plans, in close collaboration with its assigned
  TSC, the geographic combatant command logistics directorate of a joint staff, and the Army Corps of
  Engineers. Infrastructure development activities may include identifying requirements for forward basing
  and air, land, and sea transit rights through the sovereign territories of partner or neutral nations in the AOR.
  Identifying such requirements enables the appropriate U.S. Government agency to engage the relevant partner
  or neutral nations. (See ATP 3-93 for more information on infrastructure development.)
  Develop Concept and Operation Plans
  3-25. The theater army designs operations and develops detailed plans to employ Army forces in accordance
  with the GCC’s guidance. This includes supporting a JFC’s campaign to compete effectively with peer or
  near-peer adversaries below the threshold of armed conflict, or conducting Army-led operations that create
  relative advantages over an adversary. It may also include collaborating with unified action partners in
  contingency planning in anticipation of armed conflict, or responding to unforeseen events in the AOR, such
  as humanitarian crises or natural disasters. (For more information on concept plans and OPLANS, see
  ATP 3-93.)
  Maintain Threat Orders of Battle and Provide Indications and Warnings of Changes in an
  Operational Environment.
  3-26. The theater army is the only Army echelon with the persistent presence in a geographic AOR to enable
  continuous shaping and the ability to transition quickly to prevention or conflict. Theater armies in
  conjunction with joint and interagency partners, conduct continuous multi-domain operational preparation of
  the environment and multi-domain reconnaissance and surveillance across the theater to build threat patterns
  of life and orders of battle. The theater army serves as the primary conduit for strategic reach back to national
  assets and resources, the functionally aligned ASCCs, AMC, and the Theater Special Operations Command.
  It is responsible for establishing intelligence enterprise interoperability in the theater including establishing
  and maintaining agreements for rapid information sharing and coalition response to contingencies and
  emergency situations.
  3-27. The theater army executes the combatant commander’s daily operational requirements while
  simultaneously conducting adversary systems warfare analysis; target system analysis and development;
  manages target lists; and setting the conditions to enable the immediate transition to armed conflict should
  deterrence fail. The theater army coordinates with other joint and partner forces, and inter-organizational
  agencies for their supporting capabilities, as well as those forces, organizations, and agencies located in
  adjacent geographic regions. It is their responsibility to establish the necessary linkage to these capabilities
  to meet the necessary requirements during competition and ensure that the theater can rapidly accept and
  integrate functional units that expand capabilities when and where needed.