post Vietnam M1 helmet camouflage

Hi everyone, picked this M1 up recently, Not my usual area so have a couple of questions if i may?
The helmet shell is i think an Ingersoll? dating it to the mid 60’s??
The liner is obviously dated ‘73
so its (almost) late Nam period.
Its the cover im struggling with, what exactly is it?:confused:

Many thanks
Ed
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