How many variants of these amphibious vehicles were built. 1st Infantry Division Artillery 67th Field and some of 81st Anti Tank were brought ashore in them at Anzio in the Assault waves. They were loaded and unloaded using A Frame Derricks. They had experimented with them at Salerno initially with British RASC vehicles but they were too narrow so used modified American ones that had been used in the Salerno Landings. They arrived on an LST Tank where they had to be careful not to drive too fast into the sea and be overcome on the bows, one of them sank due to the bilge pump failing when there was a delay landing due to mines on the shoreline, they moved a little north to the exact designated landing zone at Piccadilly. THE ALLIED LANDINGS AT ANZIO: 22 JANUARY-23 MAY 1944 The Americans also used DUKWS in the Pacific for their 105mm howitzers.