For owners of the Sony Action Camera, here is a guide from Wayward Airsoft on how to install it to your helmet with the Arc Rail Adapter... "This Kydex adapter comes with all necessary mounting hardware and allows you to mount your Sony action cameras to the Arc rails commonly found on ballistic helmets."
Ever wondered how U.S. Army helmets are bulletproof? Well, there is only one thing to do but test one. We're pretty sure that they have been extensively tested before they get issued. If in doubt, test it again though we would recommend that professionals do it. Demolition Ranch tests one which seems to be a PASGT helmet.