M19A1 M-GMC

In 1943, the U.S. Army began development work on the T24, the successor to the M5 Light Tank. Projects that had been developed with the M5 as their foundations were revised to incorporate the T24, and in May 1943 a design was approved for a vehicle that would fit the twin 40mm gun mount from the T65 to the T24’s chassis. Initially dubbed the T65E1, the vehicle went through testing and received changes. The final design was approved as the M19 gun motor carriage in June 1944, shortly before the T24 became known as the M24 Chaffee.