Which of the following is NOT an operational command of the US Navy?

The Coast Guard Command is not an operational command of the US Navy. The U.S. Coast Guard is a separate branch of the armed forces that operates under the Department of Homeland Security during peacetime and can be transferred to the Department of the Navy during wartime. Its primary functions include maritime safety, security, and environmental protection, which differentiate it from the Navy's operational roles in maritime defense and power projection.

In contrast, the Military Sealift Command, US Fleet Forces Command, and Naval Forces, Europe are all integral parts of the Navy's operational structure. The Military Sealift Command is responsible for providing sealift and ocean transportation for all military services. The US Fleet Forces Command is focused on naval operations on the East Coast and is responsible for manning, training, and equipping naval forces. Naval Forces, Europe operates within a specific geographic area and is tasked with the readiness and deployment of naval forces in that region.