This page of our guide points out all the locations you need a key for.
What are the keys for?
Keys can open locked rooms or chests, of which there are quite a few of in DMZ.
How to get keys?
Most keys arerandom dropsfromkilled soldiers.
There is, however, a way to get a guaranteed key.
Accept aHVTmission - High Value Target.
After killing the target in question, you might always loot a building key from them.
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