I seem to remember that when metal helmets were introduced in WW1, a number of British units refused them because they damaged visibility, and added weight.
There was some ill feeling at the time also because before helmets were standard issue, there were hardly any soldiers hospitalised with head wounds, but after they came in there were many soldiers with near fatal head injuries - this was seen in some quarters are proof that helmets made you more likely to suffer a near fatal head-wound.
What people didn't all realise at the time was that the number of head wound fatalities fell dramatically - in other words previously fatal head wounds were now ending up in hospital with life threatening injures.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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