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I hope you muted the video in time. Anyway, I showed this thing from 2022 because I remember having asked ballistic helmet manufacturers on Eurosatory 2018 why they don't provide a proper helmet for support troops.
Those hardly ever wear their helmets - on the head even more rarely than otherwise. Wartime videos shows that such military personnel does not even bother to keep helmets close by. So they simply wouldn't have ANY ballistic protection in the event of a surprise attack with things that fragment.
A compromise helmet that's carried on the body at all times (when awake) and sacrifices some quality to achieve this would be a great leap forward.
This mirrors what I wrote about 500 gram escape hoods to survive first 20 minutes of a chemical attack until you reached the bulkier & heavier 'proper' NBC mask and a PDW designed to be carried at all times (when awake).
A soft design would be even more comfortable than that origami thing and without gaps, but the trauma issue probably excludes soft armour from head protection until someone finds a non-newtonian fluid that's really suitable for body armour and affordable.
A helmet that would be worn at all times would need to be lightweight and less bulky. A reduction of the protection rating from NIJ level IIIA even down to equivalent of PASGT 'flak vests' (less than NIJ level I, 15-20 layers aramid/kevlar) would be acceptable, or a reduction of coverage (as that origami thing would have; maybe -20% coverage). 80% weak protection would still stop 80% (by area) of 80% (most fragments are weak) of all fragments of an ordinary Russian HE grenade that a low cut thick adamantium armour helmet would stop.
NIJ level IIIA helmet shells aren't made of thick adamantium armour, they may stop only 90% of fragments (depends on the shell/mortar bomb and distance / also the rims are weak), so it's overall a reduction of protection from about 0.9 to about 0.64. The realistic comparison for a support troops ballistic helmet would be to no helmet at all, though - and that's an improvement from 0.00 to about 0.64.
Such a support forces 'carry at all times' (on the back, belly, on upper legs maybe?) helmet coupled with a 'wear at all times' flak vest (20 layers aramid, most times not closed, sufficient ventilation) would be a huge improvement for the protection of support troops within divisions in the field. A full performance mil spec helmet and (over-)vest could still be at the motor vehicle or camp bed.
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