parachutist helmet ?

Have had this old Kevlar helmet since the'80s and have always thought it was a British Parachutist helmet.

Lately, I've tried researching it, but to no avail. It has M4 written in marker on the front and back of helmet.   Anyone have an idea of what this could be ?  Thanks ..





                                                                                                                                                                                                                                                                                                                                                                   
                                                                                                                

It looks externally pretty much the same as my smooth shell British Para helmet. I assume any identifying labels that would be on the inside are missing.

https://www.warrelics.eu/forum/ballistic-composite-helmets/early-british-lightweight-para-helmet-m76-711226/

Thank you guys .

Looks like it is a Brit helmet after all.. I found absolutely no info on it at all..