Which command structure consists of forces from multiple military departments under one commander?

The correct answer is Unified Combatant Command. This command structure is specifically designed to integrate and unify forces from multiple branches of the U.S. military, such as the Army, Navy, Air Force, and Marine Corps, under a single commander. It is established to conduct operations that require the coordinated efforts of these diverse military services, allowing for enhanced communication, efficiency, and operational effectiveness in achieving strategic goals.

Unified Combatant Commands operate across geographical regions or functional areas, ensuring that the capabilities and strengths of all military departments can be leveraged collectively. This fosters comprehensive planning and execution of military missions that are complex and require multi-service collaboration.

In contrast, Combined Command typically refers to the partnership of forces from different countries working together under a single authority but doesn't inherently involve multiple branches of the same nation's military. Joint Task Force focuses on a specific mission or task and can involve forces from different services, but it is temporary and not a standing command structure like a Unified Combatant Command. Civil Command relates to the authority directed toward civil matters and governance, not military integration.