There is a "ballistic coefficient" of steel in helmets meant for combat. While I'm not a metallurgist -- this much I understand -- the steel used had to have a certain hardness and resistance to being penetrated by shrapnel (the big killer on battlefields, not small arms fire). That may be why there are code numbers stamped into the steel so that batches of helmets made of the same steel could be accounted for.
That is also why the lightweight police helmets with their salt and pepper ventilation holes were NOT used in combat by medics regardless of what you may have read in a book. Medics are more exposed than anyone else on a battlefield retrieving the wounded and wore the same Stahlhelm as the infantry.
That is also why the lightweight police helmets with their salt and pepper ventilation holes were NOT used in combat by medics regardless of what you may have read in a book. Medics are more exposed than anyone else on a battlefield retrieving the wounded and wore the same Stahlhelm as the infantry.
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