Woooot. Bert gets it. It is the M-41 Walker Bulldog.
Wiki - The M41 Walker Bulldog was a U.S. light tank developed to replace the M24 Chaffee. It was named for General Walton Walker who died in a jeep accident in Korea. On 7 November 1950, the US Ordnance Committee Minutes (OCM) issued item #33476, redesignating the heavy, medium, and light tank classifications to classifications according to armament; the 120mm (heavy) Gun Tanks, 90mm (medium) Gun Tanks, and the 76mm (light) Gun tanks.[SUP]
A guess if you ever saw one. Remembered it because one of my brothers had it as a model (I think Tamiya) when we were kids. It had two engines and you could drive it a bit around (the tracks kept coming off).
There is a great book on W. Walker called 'Patton's Bulldog' it is a must for anyone who is into Patton, great insight from a different perspective, can't get at my library right now but will post in book section later...