DMZ key and locations in Modern Warfare 4

There are loads of DMZ keys in Call of Duty: Modern Warfare 4. Used to open both locked containers and locked doors, keys are your fast-track to getting your hands on some of the best loot the extraction mode has to offer. However, when you receive a key, you're only given a brief description of where to use it, so we're going to outline where you can use every key the game has to offer.