Hitler was epiclevel flawed, but he didn't weasel out of military service. Part of his drive was overdone patriotism.
On this note, a pet peeve of mine is when someone uses words like "brave" or "cowardly" describe someone's moral character, because that's just not what those words mean. Quite the contrary, official diagnosis criteria for psychopaths includes a "dulled fear response." The objectively are not cowardly and that makes them a lot more dangerous. Many low empathy internet trolls are arguably kept in check by the fact that they aren't brave enough to do any of that in real life.