Growing up in an Italian family, you use a harsh tone and 10 minutes later everybody forgets about it.
Any of these Vietnam vets that have been there and know the deal, they don't feel that any Hollywood endeavor about the Vietnam era has ever gotten it right yet.
A guy's biggest style mistake is definitely trying to look too cool. As long as you've got a good pair of jeans, a good pair of boots and a few good shirts, you're fine.