The Anti-Aircraft Site protecting Isla Del Leon
- Make your way to the Northern helipad on Isla Del Leon.
- Once you land on there, make your way over to the Western side.
- Go to the Southwestern corner, where a Guard Post is.
- Head inside the Guard Post to find the Depleted Uranium.
- Collect the Uranium and then turn to the nearby cannon.
- Just destroy it with any variant of Explosives to clear this area.