 The Marine Corps requested that the boats have retractable hinged ramps at the bow-replacing the machine gun mounts; and it was adopted as the standard personnel landing craft, the Landing Craft Personnel (LCP(L)) by 1940.Fleet Landing Exercise Number Six was the first wartime exercise in amphibious training in 1940–1941.It became clear that the Navy and Marine Corps was in dire need for amphibious transports larger than destroyers as the 1st Brigade could barely send two thousand Marines to land in the Caribbean and only adequate experimental landing craft were provided.