Just follow your men through the small camp you find yourself in. When you get inside the second tent, you'll find a table with another Radioman Tape. Grab that and then head through the door of the tent to the left.
Follow the next waypoint. You'll come out above a battle. You are trying to protect the men in the building across the street by killing the enemies in the street. You'll get some that will come into the street from the side of the other building in the distance. If you slide for to the right near where your squad is taking cover, you should find an RPG-7. Feel free to use this. Kill as many enemies as you possibly can. Just stay here and keep plugging until you're told to move forward or you start running low on ammo and need to find more.
After the streets have been cleared, head for the front of the building and you'll be invited inside. Go in and meet Agent Jeff Riggs. You'll get flash banged and end up on the floor. Riggs will use you as bait and kill two of the attackers. When you stand up, check the table just to your right for Konrad's Psych Profile. Go through the broken glass doors ahead.
A few enemies will come at you on this floor through the doors at the back but make sure you watch for the enemy on the balcony above those doors as well. Kill them and then head forward and to the left. Take cover by the gate and clear some of the next room, particularly the small room just to the right. When you can, vault into the room and take cover behind one of the chairs.
Enemies will start pouring in through the doorway on the far side. They shouldn't prove to be too difficult but watch for the two enemy soldiers on the roof just over that doorway (this is a second set of snipers). Keep killing the regular soldiers and a heavy will come through. Lob grenades and keep shooting to take him down. When he's dead, kill any left overs and head up the stairs that they came down.
You'll find Riggs in the next room. He'll open a gate to the kitchen. Grab the ammo crate on the right side of the kitchen. Go through the kitchen and up the stairs to the next level. There will be a few enemies on this level but nothing major. Work through this floor slowly until you come to another set of stairs. You'll be in a room that overlooks the Aquatic Coliseum. You'll try to leave but the door will be jammed. Take cover here as enemies will come up behind you.
Stay here and it shouldn't be a problem. You'll get a bunch of normal enemies that will just walk straight at you. After you've cleared the room once, you'll meet a new special unit with heavy armor and P90's. They will fire fast and take quite a bit of damage. Keep pounding on these guys and they'll go down. While guns might not do much to them, they will get knocked over and be temporarily stunned by melee attacks. This will allow you to kill them with ease. After they are dead, more regular enemies will storm the building. Keep fighting them until eventually Riggs will open the door.
Follow Riggs down the stairs into the lower levels of the building. This will bring you to a parking garage. Immediately turn left and take cover behind a car. Let a few enemies approach you and take them out. Then move up from the green car to the yellow car just ahead. If it is safe, keep moving up to the white car. Peek around the right side of the car and clear out the enemies there. Move forward and take cover behind the barrier. You'll likely find some enemies in this area as well as a turret in the distance. Kill the regular enemies and then just have your squad attack the turret with you. Eventually, a few shots will get through and kill him.
Approach the turret and the jeep. Back the back left tire of the jeep will be a grenade crate. From the jeep, turn right and you'll find Riggs. From this path, you can get outside and into the Coliseum.
Go inside and quietly take down the first enemy you come across. Grab his sniper rifle and quickly take cover behind the railing before you get sniped from across the room. Post up here and take out the two snipers in the distance. When it's safe, just start sniping everything in sight. Shoot into the lower levels. Shoot into the seating area to your right. Whenever you reach a point where people aren't shooting at you, follow this level around to the right side. When you round the corner to the left, you'll find more snipers on the same catwalk but on a different side. Take these two out and then once again try to clear the lower levels.
When it's safe, go down the stairs at the waypoint. When you get to the bottom of the stairs, peek around the corner into the next room. There will be a few enemies in this room though most will be at a distance. Kill them and watch for the Edge Weapon Specialist coming up the left side of the room. Kill him and any others. Go past them and you'll come to another sort of balcony area. You won't be able to see perfectly but you should be able to see below you pretty well. Kill any enemies you can find including the ones slightly to your left.
Before going down the stairs, check just to your left for some vending machines and an ammo crate. Now go down the stairs. If you've killed everyone, you can just run along this level until the end and go down a floor. Just before you do, grab the grenades at the top of the stairs. Go down the stairs and then work your way down another hall. At the end will be a crate that explodes. Light that to take out a couple of enemies. Watch out for another Edge Specialist.
Go past the dead bodies and turn right. Go down the next flight of stairs and take cover. You'll be looking along two different paths. On the left will be a bunch of crates and sand while the right will be part of the floor you are on now. Clear both before you move up. Stick to the sand until you get to the front of the truck. Take cover at the front of the truck but be careful because sometimes an enemy will just decide to come around the corner. Kill any such enemy and then kill the enemies in the distance. Watch out for the turret on the jeep as well. When everything is dead, the chapter will end.
Chapter 10B: Stealing Water
This part is on rails and requires you to shoot grenades at enemies to stay safe. You'll get some simple enemies running along the sand to the right for target practice. After the convoy rounds the corner, you'll find some enemies repelling down. Kill them.
Soon, the convoy will stop in front of a large building. It won't be easy to handle immediately but after a try or two, you'll likely have it. First shoot the wall behind the lower right floor. This will kill the enemy there. Now aim up and hit the turret on the second floor. Now just watch for the enemies as they appear over the building. Try to use just one shot each and aim a little high. Doing so will generally set off extra explosions killing the enemy in the process. The convoy will continue on.
You'll come to a right hand turn. You'll see a chopper but ignore it for now. Kill the couple of enemies at the corner and then you'll go up the street a little. A jeep will appear. Destroy the jeep and then turn to the chopper. Take that out quickly because another jeep is going to appear on your right and then cross over to the left. At this point, you lose control.