This guide will let you know where to find Building 21 key in Call Of Duty Warzone 2.0 DMZ. It is quite easy to do so, you just have to follow the simple steps below to find it.
There is a number of places to find the Building 21 key in Call Of Duty Warzone 2.0 DMZ. You can get it in the normal supply chest or you have to shoot down the general boss helicopter that flies around to get it. The best way is to use the Sam sites to shoot down the planes and then chase the supply crates that they drop.
