I remember these vehicles were still in use by the US Army until replaced by the LARC. The DUKWs had a tendency to capsize upside down before sinking. We were required to remove the canvas and ribbs before going water borne. I remember being told to wear a life jacket and swim away from the vehicle if it should start to sink. I also remember several real bad accidents that killed a number of passengers on the Duck boat rides. We had several in Philadelphia, PA.