DUKW amphibious truck fitted with extensible ladders borrowed from the London fire brigades. 4 of these (named Swan 1-4) were landed with the Rangers at Point du Hoc. To assist in the mission, the ladders were fitted with a pair of Lewis light machine-guns at the top to help clear the cliff-top of any opposition.
Although three of the four arrived safely, the shoreline was too torn up by the preliminary bombardment to provide the necessary footing for the vehicles, so they were not used.