A large military base was built off the coast of Los Santos. But it has not yet been put into operation, so the military is not there yet. But there are a lot of different objects. And some hangars are guarded by air defense systems and can shoot you down. An aircraft carrier is also already moored at the base.
What we have:
Airstrip for aircraft;
Two helicopter landings;
Many barracks;
Military buildings with opening gates;
Aircraft carrier;
Areas for unloading military goods;
Underground laboratories;
Berth for small craft and boats;
Air defense systems;
Guard bridge around the perimeter.
The entrance to the underground laboratories is open, and so is the aircraft carrier.
Not a bad place to study or catch up with the police and the military.