A brand-new field upgrade is here to change the tides of war. Here is how to unlock and use the Portable Decontamination Station in Warzone. How to unlock the Portable Decontamination Station in Warzone‚ Modern Warfare 3 There is no way to unlock the Portable Decontamination Station since it is a field upgrade for Warzones. Contrary to Multiplayer or Zombies‚ Field Upgrades in Warzone are not something you can choose in your loadout‚ but an item you can purchase in-game through Buy Stations‚ obtainable randomly in loot caches‚ or even dropped from enemies. So‚ if you want to use the Portable Decontamination Station‚ you must get it while also attempting to survive incoming enemy fire. How to use the Portable Decontamination Station in Warzone‚ Modern Warfare 3 You’re likely familiar with how Battle Royale matches work. You’re fighting in a giant circle that gets progressively smaller and smaller until you and every other remaining player are nestled closely ...