What is the term for a command with a broad mission under a single commander, composed of components from multiple military departments?

The correct term for a command that has a broad mission and is led by a single commander, consisting of components from multiple military departments, is Combatant Command. Combatant Commands are established by the Unified Command Plan and are responsible for specific geographic or functional areas. They enable a unified approach to military operations by integrating forces from different branches of the military, ensuring that resources and capabilities are effectively coordinated and utilized to achieve strategic objectives. This structure allows for enhanced readiness and operational flexibility in addressing various threats and missions.

Understanding the role of Combatant Commands is crucial as they serve to streamline command structures and improve joint operations, providing a higher level of coordination among various military branches.