What upgrades an I unlocking?
When I complete missions and level up the units the missions are related to, for example, Tactical Warfare Unit, when I go then to the Supply Stations, I see I'm unlocking the items I already have. For example, as I leveled up the unit, I have unlocked GTI helmet (purple) multiple times, despite the fact I already had access to it and used it many times. So, what exactly am I unlocking? Is it better values, like hearing range, for the same item or what?