The armed forces of the u. s. conduct military operations as a in which elements of two or more military departments participate.

Joint Force

Explanation:

According to my research on different military operations, I can say that based on the information provided within the question the US conducts military operations as a Joint Force. Like mentioned in the question this is a form of combined arms warfare on a larger, national scale, in which more than one forces from a state's army, navy, air, and special forces work together in joint operations to complement each others abilities in an operation.

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