Which of the following is a functional combatant command?

• A. USSOCOM
• B. USEUCOM
• C. USINDOPACOM
• D. USSPACECOM

Answer: (A)

Functional combatant commands carry out missions that cross geographic regions and service lines. United States Special Operations Command fits this pattern because it coordinates and conducts special operations across all services and theaters, rather than being limited to a single geographic area. This cross‑cutting, global mission is what defines it as a functional command.

The other options align to specific regions or domains: USEUCOM has responsibility for Europe, USINDOPACOM for the Indo-Pacific, and USSPACECOM focuses on space operations. These are geographic (or domain-specific) commanders whose authority centers on a defined area or domain, not across the entire globe for a type of mission.