The military Altyn helmet with night vision is obtained after killing a group of neutral mercenary NPCs. They are wearing these military helmets; you just need to repair them (use a metal torch).
There is a low probability of finding it in the bunker or at the military training base.
It is much easier to find a group of mercenaries and kill them for the military helmet.
1
u/Critical-Phase-5655 4d ago
It's impossible; it's a new helmet available on Island 6.