Add radios to all helmets.

[Chosen One]

Add radios to all helmets. Maybe make a radio part of the process.
This is a Russian Tanker's helmet, a little more advanced than the WWI era skull cap used as "Leather Helmet" (when it shouldn't be giving ANY protection from injury), but really not that much. What it shows though is the earphones of a radio set (with hearing protection as well, that's the main reason why they're the size of baseballs).

[Xeen]

Don't know about the metal mask, but practically every other helmet could contain built-in radio (or be able to get radio upgrade), especially the leather armor helmet. It also has stated in the description that it can be mounted with a radio.
'The side slots can be upgraded with headphones for the Wattz Electronics 2043B Radio. '

[Chosen One]

Uh, ya, ok, other than masks...... (In,my defence I don't use masks, so I would forget about those....)

[Programmer]

I barely remember but i think it was suggested in the past. Anyways, should be added.