Today the POTD is not actually a photo but rather an old advertisement from Chrysler Corp that appeared in the Feb 1944 issue of Popular Science. We have a fondness for old ads featuring US tanks, this is a particularly fun one. This ad is about the M4A4 variant of Sherman tank equipped with the Chrysler A57 multi-bank engine. The Multi-bank consisted of five 6-cylinder in-line Chrysler engines mounted together to generate a total of 470 horsepower. The ad is somewhat inaccurate in that the M4A4 was not used by US forces overseas but rather was restricted to training duty or given as lend lease equipment, primarily to the British.