text: Chapter 1
  1-13. Since Army forces conduct operations in support of joint campaigns, which for the most part occur as
  part of a larger coalition operation, leaders must understand the interdependencies between their own
  assigned forces and the forces or capabilities provided by others to generate the complementary and
  reinforcing effects of combined arms approaches. Army forces employ unified action partner capabilities to
  the degree they are available. Sustainment increases the effects of capabilities employed by unified action
  partners through efforts such as training exercises, agreements, and standard operating procedures (SOPs).
  However, because peer threats can contest the force in all domains, sustainment forces must be prepared to
  conduct operations when some or all unified action partner capabilities are unavailable to support mission
  accomplishment.
  STRATEGIC CONTEXTS
  1-14. Army forces must meet a diverse array of challenges and contribute to national objectives across a wide
  range of operational categories. Sustainment operations shape OEs and set conditions that are favorable for
  future operations. Employing sustainment capabilities during competition increases cooperation between
  coalitions and allies and builds partner capacity. Army forces build partnerships, capabilities, and mutual
  trust through combined training exercises, standardization, and increasing interoperability between coalitions
  and allied partners.
  1-15. Figure 1-2 provides an illustration of the Army strategic contexts. Combatant commands (CCMDs)
  and theater Armies campaign across the competition continuum and Army tactical formations typically
  conduct operations within a context dominated by one strategic relationship at a time. The theater sustainment
  command (TSC) and task-organized elements can be simultaneously engaged in supporting sustainment
  operations during competition in one operational area within the area of responsibility (AOR) while providing
  sustainment support to crisis in another operational area and sustainment support to armed conflict in yet
  another operational area within the AOR. See JP 3-0 and FM 3-0 for additional information.
  Figure 1-2. Army strategic context and operational categories
  COMPETITION BELOW ARMED CONFLICT
  1-16. Competition below armed conflict exists when two or more state or non-state adversaries have
  incompatible interests, but neither seeks armed conflict. Nation-states compete with each other using all
  instruments of national power to gain and maintain advantages that help them achieve their goals. Low levels
  of lethal force can be a part of competition below armed conflict. Sustainment operations in support of
  competition include support to CCDR daily operational requirements, Title 10 requirements, Army support
  to other Services, support to military engagement, security cooperation, and set-the-theater tasks. These
  operations build trust and confidence in our allies and partners while ensuring the United States is prepared
  for future operations. During these operations, sustainment forces invest in facilities and infrastructure
  development as well as civilian engagement to build partnerships for required capabilities, capacities, and
  support needed during operations. For additional information see FM 3-0, ATP 3-93, and ATP 4-93.