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Any field gear that was US made would probably have the NSN number indicating "00" or "01" for United States made.

My grandmother wore something like that on her head when she occasionally went swimming.

Under the NSN system "8415" means "clothing, special purpose" and includes combat uniforms and helmet liners among other things. The next two numbers is the supplier country. If US produced it will...

Mr Austin's explanation of the "50" code seems plausible to me.

An interesting discussion on Nato Stock Numbers. Actually they can be used to help date an item. In the case of the M1 liner with "50" country code, what you have to remember is other countries have...