Camp Belica
You will only be able to obtain it in the mission in which Knife wants to incinerate you. After you collect the medicine, return to her and she will give you the letter. He is the officer there so, you will have no problems finding him. In the room next to the one where Knife tortures prisoners. On the shelf, next to the sink, there isCode 7:5. Code 7:6is in the room with the documents and security systems controls....