The Anglo-Saxon Empire wrote:Plain Kevlar? You aren't a real man unless you wear a helmet that can take an armour piercing rifle round to the head.
Not quite "plain Kevlar" - multiple layers with ballistic fabric and other components. The existing helmet is rated Type III. However, it is vulnerable to direct hit from an armor piercing rifle round. Hence the switch to the Dominion nanotech helmet, which is rated Type V.