Call of Duty games have required players to level up to gain access to better weapons and skins for the longest time. This process can sometimes become quite tedious which is why some Call of Duty: Vanguard players have begun to abuse an exploit that fast-tracks this process.
This Call of Duty: Vanguard exploit involves players loading into a game of Zombies for about 2 minutes before exiting the game and repeating until they are satisfied with the amount of XP they have received. This is due to
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