Well, for 1, NO neckbeards then!
For 2, Why not trimmed goaties, longer sideburns and not-Hitler mustaches? I mean, completely bald—shaved heads, waxed bodies, plucked eyebrows— would look even more uniform, but sometimes one wants to actually be not unattractive to women.
Well, then you definitely didn't want to wear the old Army-issued eyeglasses!
Good points but even goatees and longer sideburns would affect the face seal of the protective (gas) mask, IMHO.
It always amazed me that Hitler’s mustache looked like it was out of the U.S. regulation as an example.