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In case anyone cares, requisition packs can easily be obtained during this event. The packs are used for the bounty to get the Hunted outfit. You can also use them to make subsonic ammo. Go to one of the outposts, kill the mercs, loot the packs from them, quit to the menu, continue, and go back to an outpost. I used the one in the slums.
Does the event work only when connected online/using Galaxy? I assume that's the case.
Yes.