Which type of staff supports more than one military department?

• A. The Air Staff
• B. The Unified Staff
• C. The Defense Staff
• D. The Joint Staff

Answer: (D)

The ability to coordinate across all the military services is what this staff is built for. The Joint Staff serves the Chairman of the Joint Chiefs of Staff and brings together representatives from the Army, Navy, Air Force, and Marine Corps to produce unified plans, doctrine, and operations. This cross-service collaboration means it supports more than one military department, guiding how the entire armed forces work together rather than focusing on a single service.

In contrast, the Air Staff concentrates on Air Force matters, while the other staffs are oriented to their own service or to specific command structures, rather than serving as the central, multi-service coordinating body.