When it comes to discussing tank aces of World War II, many people tend to focus on "Panzer Aces" and their accomplishments.

The Panzer IV Ausf H was also fitted with a long-barreled L/48 gun, which was considered at least as effective as the 76.2mm (three-inch) main armament of the Soviet T-34.

Now, he says, he spent $2.5 million on the Panzer IV, a choice bit of history that he bought in July to add to his museum of military memorabilia housed in his Flying Heritage Collection in ...