Most of the exes storming the Big Wall were wearing helmets.
Several of them wore motorcycle helmets with Lexan visors. A few looked like SWAT or National Guard issue. Freedom saw a few football helmets and hard hats. Even a few gleaming bicycle helmets, useless as they were.
…
The attack was spread across a section almost forty feet long and, from the look of it, another twenty or thirty around the corner. Legion had at least four hundred exes under his control.

Excerpt From Ex-Communication, pg 13-14
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546