What type of fuel does the USNS Mercy primarily use?

The USNS Mercy primarily uses DFM (Diesel Fuel Marine) as its fuel type. This type of fuel is specifically designed for marine vessel operations and is suitable for the powerful engines on the Mercy, which is a hospital ship. DFM is known for its efficiency and is utilized in large vessels to provide the necessary propulsion and electrical power systems. This choice aligns with the operational needs of the ship, which must maintain reliability and endurance while performing its mission as a floating medical facility.

The other fuel types listed, such as jet fuel, heavy bunker fuel, and gasoline, either do not provide the necessary performance characteristics for a vessel of this type or are not compatible with the ship's engines and systems. Heavy bunker fuel, for example, is typically used in larger cargo ships or tankers but can require specialized handling and equipment due to its viscosity and contaminant levels. Gasoline is not used for large marine engines, as it does not meet the safety and operational requirements of military vessels.