Which of the following is a characteristic of a Combined Command?

A Combined Command is characterized by its inclusion of forces from more than one nation. This cooperative structure is essential in multinational operations, where various countries come together to achieve a common objective, allowing them to share resources and expertise effectively. This collaboration ensures that diverse capabilities and operational strategies from allied nations enhance the overall effectiveness of the mission.

The other aspects mentioned, such as single-nation forces, independent operation, and limited geographical scope, are inconsistent with the fundamental nature of a Combined Command. It is specifically designed to foster interoperability and joint efforts between nations, which distinguishes it from commands operating within the confines of a single nation or those that do not coordinate with others.