First reported by GamesRadar, Helldivers 2 developer Arrowhead has politely requested that players refrain from killing their teammates who are wearing the fancy blue preorder armor, no matter how much you may want to stick it to those nerds and their silly little outfits.
The SUMY Corporation froyo salesman armor was a preorder bonus for Helldivers 2, one that'll likely never be made available again. While some fans jokingly call it the "UN Armor" in reference to the organization's blue-helmeted peacekeeping force...