The worst presidents were ex military men? Huh - George Washington did ok, and so did James Monroe, Andy Jackson and Abraham Lincoln. U.S Grant wasn't much of a much, and neither was JFK. Harry Truman was pretty good, and both Teddy Roosevelt and Ike had their moments. George H. W. Bush did alright, within his personal parameters, as did Gerald Ford. I refuse to categorize what George W. Bush did as military service.