It closely resembles Vandenberg Air Force Base in California, and also resembles AREA 51 on signage.
The base serves as a military operated and owned air-strip and munitions depot for the United States Air Force. The base is heavily guarded and protected, with high, anti-scale fencing stretched along the perimeter. The two access roads that join the base to the outside world are controlled by checkpoints. Armed guards sprawl within the base, with frequent patrols in either Rhino Tanks or Crusaders. The airspace as well is patrolled by fighter jets and Cargobobs.
The fort features one main airstrip, one large hangar, few smaller hangars, a munitions depot, a fire and rescue station, a refinery, an air traffic control tower, a main office and some barracks.
Like Area 69, Fort Zancudo is a restricted air base.
If the player flies over the area, the player will receive a 2-star wanted level and a air traffic controller will warn the player via radio to immediately divert course and leave the airspace. If the player chooses to ignore the warnings and continues flying over the base, the player will gain a 4-star wanted level and lock-on missiles will shoot the player down, regardless of position, about 10 seconds after the warning is given. It is possible to break missile lock and evade being shot down if the player is proficient at flying and is using a fast aircraft.
Should the player enter the base on the ground, a 4-star wanted level will be received and the base alarm siren will go off. Armed Guards, Rhino Tanks and aerial patrols will shoot on sight.
However, if the player steals a military vehicle from the base, the police will pursue instead of the military.