What are the Unified Combatant Commands composed of?

Unified Combatant Commands are composed of forces from two or more military departments. This structure is key to ensuring that these commands can leverage the capabilities and resources of different branches of the military, such as the Army, Navy, Air Force, and Marine Corps, to achieve unified operations and integrated strategies. The purpose of this multi-departmental integration is to enhance operational effectiveness and respond more effectively to national defense and security challenges.

The composition of Unified Combatant Commands is designed to facilitate joint operations, where a seamless collaboration among different military branches maximizes combat readiness and operational capabilities. This command structure allows for a more versatile and adaptable military response, as it draws on the strengths and specialties of various forces.

The other options focus on singular military departments or specific types of forces, which do not capture the true essence of Unified Combatant Commands that require diverse capabilities and integrated efforts across multiple branches to address complex global challenges.