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The security office consists of a main jail room that consists of a single large jail cell, a Nuka-Cola vending machine, a small evidence room containing various lootables, a bathroom, shower room, and a smaller room south containing a desk that has Jet placed on top of it, as well as the Diamond City jail key in the desk. There is also an old parking garage, converted into sleeping quarters. The protectron will attack you if released, as the terminal suggests it will, unless its alliance parameters are overridden by the Protectron override program.
In the small room to the south lies the Diamond City jail key.
The security office appears only in Fallout 4.