As US-built armor came into contact with Axis forces in WWII (first of all in North Africa), it quickly became clear that the 37mm cannon favored on US armor was simply inadequate against the tough armor of those adversaries. The tall silhouette and slab-sided construction of many US vehicles also demonstrated the need for a new US tank. The M24 was developed to address all of these concerns and more. Armed with a 75mm main gun, the Chaffee was able...