text: Fundamentals of Multinational Operations
  Army. The Army’s interoperability priority focus areas comprise the following functional areas:
  communications and information systems, each member’s intelligence community, fires, and sustainment.
  Table 1-2. The four levels of interoperability
  Level Operability Description
  Level 0 Not Interoperable UAPs have no demonstrated interoperability. Command and control
  interface with the Army is only at the next higher echelon. UAP
  formations must operate independently from U.S. Army formations and
  operations.
  Level 1 Deconflicted U.S. Army and UAPs can co-exist but do not interact. Requires
  alignment of capabilities and procedures to establish operational norms,
  enabling UAPs and the U.S. Army to work together.
  Level 2 Compatible U.S. Army and UAPs can interact with each other in the same
  geographic area in pursuit of a common goal. U.S. Army and UAPs
  have similar or complementary processes and procedures, and they
  can operate effectively with each other.
  Level 3 Integrated U.S. Army and UAPs can integrate upon arrival in theater.
  Interoperability is network-enabled to provide the full range of military
  operations (ROMO) capability. UAPs can routinely establish networks
  and operate effectively with or as part of U.S. Army formations.
  UAP unified action partner U.S. United States
  Figure 1-2. Levels of interoperability and priority focus areas
  MISSION PARTNER CAPABILITY
  1-33. Allies and partners have considerable capabilities that make them a credible deterrent against adversary
  aggression, improve combined collective capabilities, and lessen the burden on U.S. forces should deterrence