The experience of employing the M3 GMC, M6 and M10 in North Africa all fed into the plans for the next generation tank destroyer, which eventually saw service as the M18, nicknamed the "Hellcat". It was equipped with a newly designed 76 mm gun—firing the same shell (from a different cartridge case) as that on the M10—mounted on an all-new chassis. This new design allowed it to be ten tonnes lighter than the M10, which allowed for a remarkable road speed of over 50 mph. However, it was still lightly armored—indeed, it had only half the armor of the M10—and suffered many of the survivability problems of its predecessors. The M18 began to see service in mid-1944.