my first encounter with a real operational tank was at a GM Powerama display down by Meigs field in Chicago about 1956 i think , they had an M48 tank that climbed a vertical wall i dont remember how hight the wall was not over 34 inches i think. but i can rememberi ts glossy milk chocolate od color and the enthusiasm of the troops that were her crew. Oh, we were part of busloads of CPS high School students who ere bused to the event on school time. it was a blast and that is the part of the event i liked most. it was really more about cars.