Military rule is because gas masks won't seal if you have a beard. Same for fire departments.
Exactly.
dubious
Supposedly that's why Hitler had the mustache he did. In ww1 he had a big mustache, they got hit with mustard gas and his mask wouldn't seal. Shortly after he chopped the sides of the mustache off. Interesting historical fact.
There's a reason why many serious divers have little to very sorted facial hair.
How is that dubious? That's a factual statement. There is no argument against it. A gas mask will not seal with more than half a day's growth of facial hair.
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