Nice thread reading this makes me think that I wish I had known more at 18 19 yoa about these in 1971 as I am sure most of ours would have been some of the 60's ones you mention or even earlier. I did remember having a cardboard liner which I thought nothing of until years later reading about it was one of the Hawley liners just to think what was in the supply room and helmet refurb shop. timothy
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