Well, speaking as someone who went and got shot at some, I’d say Romney showed better judgement than I did - considering how the military and political leadership pissed the whole thing away.
Or maybe he was just lucky, always a good trait in a president.
Romney not serving the United States in the military is not "luck", no male in his direct line has ever served us in the military, ever.
The Romneys arrived here in 1842 to serve Joseph Smith personally since they arrived.
No war, no peace time, no draft, no wave of patriotism, has ever snagged one from his line, Romney is the second of his line to run for Commander in Chief of American Armed Forces during wartime, in a row.
This family won't do military service, but they do crave the presidency.