 Along with the infantry landing in the second wave , supporting arms began to arrive , meeting the same chaos and destruction as had the rifle companies . Combat engineers , tasked with clearing the exits and marking beaches , landed off @-@ target and without their equipment . Additionally , with the exception of DD tanks , they did not have the benefit of " Hobart 's Funnies " ( a wide range of British @-@ designed , specially adapted armored vehicles specifically designed to penetrate German fixed defenses ) which had been offered to American commanders , and were accepted . The Americans requested all " Funnies " that were based on the Sherman M4 tank chassis , but the vehicles could not be produced in enough quantity to supply both the Commonwealth forces and American forces in time for D @-@ Day . Even if enough could have been produced in time for D @-@ Day there were not enough LCTs available to carry the DD and wading tanks and the " Funnies " . 
