He replaced the LCP(L)'s rounded bow with a retractable ramp.
The LCVP (Landing Craft, Vehicle, Personnel) was developed because the U.S. Marines needed a boat capable of transporting vehicles to shore. Higgins adapted the LCP(L) to meet this requirement. He replaced the LCP(L)'s rounded bow with a retractable ramp. The new craft was tested for the first time on May 26, 1941, on Lake Pontchartrain. It carried a truck and 36 Higgins employees safely to shore. The LCVP became the military's standard vehicle and personnel landing craft. Thousands were in service during the war.