Is this Vietnam m1 airborne helmet genuine?

[Lord Joeldemort]

Thank you in advance!

[ruddersrangers44]

Apart from the elastic band which looks off but could just be the light and the chinstraps have way too much extra length as should be no material left over for them to reach around the back,but everything else looks great,ww2 McCord shell and p64 nylon type 2 A/B liner by either firestone but colour would suggest Marmac Industries.Mitchell cover in nice condition.