The deuce's I have are all mutlifuel. My M51 has a Continental 6602 gas with Mack axles. All the rest of my trucks have Rockwells. The 5 tons have 250 Cummins except the M925A2 with has the "military 6BT" with turbo. I buy for myself. Internet auctions and private purchases. Sometimes a truck leaves with someone else. Deuces beginning to be scarce from Uncle Sam.