Kennedy, and when it came to military (not social policies) to LBJ were the last two real Democratic Presidents. World War II era veteran Demos kinda had their party hijacked by the RFK liberal wing in about 1967ish. I don't think all of the JFK-LBJ social policies were bad but when it came to the military those were the last Demos that made it to the White House that served their country in wartime. Carter was the last to serve period.
That's my issue with most Demos who've become Commander in Chief. To be able to send people to a warzone you should have at least served in the military in some capacity. I don't fault Carter for his serve, respect him for it. But Clinton and Obama were too busy bashing their country to serve it.