Use the Secure Storage key to unlock the door in the basement to find the Terminal password. Take this key with you and access the Secure Storage building outside the little fort.You will find a locked door leading to a secret basement. Now go to the building near the terminal and in one of the lockers you will find Secure Storage Key. To access the terminal you will need Command Center Password (unless you have lockpicking level 3). Once you get into Camp Venture, go into the little Brotherhood of Steel fort inside the camp and look for a building guarded by a terminal. You will need to locate the location of Fort Defiance at Camp Venture. Defiance has Fallen is the first of four quests in the Brotherhood of Steel faction series.