Installation instructions:
Unzip the archive to Steam\steamapps\common\OVERKILL's The Walking Dead\OTWD\Content\Paks\~mods
If you don't have the ~mods directory, create one.

Trivia:
Default helmet spawn chances for Family bandits:
10% on Normal
30% on Hard
50% on Very Hard
100% on Overkill

Default helmet spawn chances for Brigade soldiers:
60% on Hard
80% on Very Hard
100% on Overkill

Helmet spawn chances are rolled per individual enemy unit.

Helmets have an unused "bApplyLeftoverDamage" flag which doesn't do anything when set to "True".
Helmets have a set durability per difficulty and they will soak up all the burst damage with no bleedthrough, making for a very unfun experience.

This mod sets the chances on all difficulties to 0%. Enjoy being able to actually play something other than Grant without feeling like you're handicapping yourself.