Sadly, the only postwar President to come directly from the military was Ike. We all know that Ike was too accomodating to the opposition party then.
Ike is my favorite President! He actually could run the federal government like a well oiled machine, because he had so much experience running such large organizations. Most Presidents their ideas simply get lost in the bureaucracy a few levels down from them.
I know ideologically Ike wasn't a conventional conservative but he was pragmatic. The standard of living increase in the 50's was phenomenal.