This is the final mission, so be prepared to finally take down Menendez once and for all. You'll be in control of the wingsuit, and you need to navigate past all of the other ships and any debris first. Once you get past that, there will be missiles fired at you. They swirl and then explode, so keep moving left and right to avoid the explosion.
As soon as you land, you're thrown straight into battle. If you've gone with the default equipment, your sniper rifle should have an infrared scope on it, so you can pick out where the enemies are in the distance. If you head all the way to the left, you can find an Access box with some Quadrotors in it. Your main objective right now is to get rid of the CLAW.
Go up the hill and clear the front of the building, as well as the inside, of the enemies. If you go behind the building, you can find another Access spot that grants you the kinetic projectile weapon. Go forward until you trigger a checkpoint and you'll see some snipers in the building in the distance. Take out a few with your own rifle, or just wait until allies drop in and take them out for you.
Continue on through the fenced-in area, where you'll encounter cloaked enemies. After this area, go up the stairs, taking out every enemy you can, and you will be near the entrance of the building. There will be a CLAW in front of it, as well as enemies coming out the front door. Once it's clear, Mason will say to follow him inside of the building.
Once you get inside the building, be mindful of enemies on the second floor, and just keep pressing through until you enter a room that you can look down onto the first floor. It is here that you will encounter some ASDs, although you can get one of your own by using the Access spot on the second floor. Three shots from the sniper rifle will take those down.
Clear the rest of the enemies, then go down the hallway to find more. Once they're dead, go into the broadcast room, where you'll find some enemy Quadrotors mixed in with the regular enemies. When they're all gone, go up and to the marker to view a scene. It's now time to find Menendez, so start following Harper.
As you follow him, you'll run into groups of enemies. Be careful, as some of these enemies will be cloaked, so you won't be able to see them until they're up close. Keep pressing forward through the rooms until you come to a small, circular one. Go upstairs and take out the enemies, then run and you automatically slide under the door.
This is the very last room of the game. The floor will give away and Mason will grab onto a pipe. He will then drop down and slide, grabbing a gun. You will need to shoot any enemies in your way, as they will kill you and you'll restart from the previous checkpoint. Once you kill the other enemies in the room, a last scene will play out. You will have a choice between capturing Menendez, or shooting him; both choices will lead to different endings. You have finished the single player campaign!
