I spent some time modifying other gear leather/metal/combat armor, I got rank 1 of the armorer perk but the standard army helmet is not even showing up in the item list when I use a armor workbench.
What's going on there? Do I need further ranks or different perks? I didn't think so because other modifications are shown in the menu even if I can't craft them yet and other perks seem to be specific for other things like modifying melee weapons or guns.
Is it just that this item cannot be modified at all?