Under what terms does a combined command typically operate?

A combined command typically operates under the terms of a treaty, alliance, or bilateral agreement because these frameworks provide the legal and operational basis for cooperation between multiple nations' armed forces. Treaties or alliances, such as NATO, establish shared goals, responsibilities, and rules of engagement which guide how combined forces interact and operate. They outline commitments regarding mutual defense and coordination in military operations, ensuring that the combined command operates smoothly and effectively among partner nations.

In contrast, domestic law relates to the legal framework within a single nation and does not govern international military cooperation. United Nations resolutions may provide guidance or authorizations for specific operations but do not establish the foundational terms for combined commands. Presidential executive orders are directed towards domestic matters and can affect military operations but do not define the overarching structure of international military collaborations. Thus, the correct answer reflects the international agreements that specifically facilitate joint military efforts.