Hi everyone,
as there is no customization yet, I wanted to share with you how to put helmets on all of your soldiers.
My squads:
I personalty hate idea of going into a war-zone with hat, so here is how do do it.
You have to swap soldier with hat with one in reserve and press ok, game will generate new appearance for your soldier. Then again, put back the soldier you want with helmet to the squad, press ok, and hope it will generate helmet. If not, repeat again.
And ofc, NKVD doesent folow my orders but Stalins, so there is no fix for them 
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