After you gain control, move your way up the left side, taking out enemies as you go. You'll eventually come to a point with a jeep in the middle of the road. You can try and cap the gunner from here but I found that a frag grenade works particularly well. Kill him and clean up his friends just around him, then hug the corner to the right.
Stay on the right side and make your way towards the pile of rubble but watch for enemies spawning in the building across the street to the left. The enemies will keep respawning up ahead but if you move up, you can enter a building on the right side. This is actually the direction you want to go in, not just for flanking. Go inside and make your way upstairs. When prompted, follow Sandman until you come out to a larger open area.
A helicopter has slammed into the wall and you'll have to deal with enemies in front and above. You can use the area by the door for cover to take them out. Continue to follow Sandman around the corner to the right and you'll head back downstairs. When you get to a door leading outside with voices on the other side you will be prompted to toss a 9-bang which is your tactical grenade. Do so and then kill the two enemies on the other side of the door, one coming down the stairs and one in the middle of the alley way. Go up the stairs he was coming down.
Go through a couple of rooms and head down the stairs into what looks like jewelry store. A group of enemies will flood the room through the big hole in the wall so you can retreat either back up the stairs or use the display cases on the left side for cover. Either way, this is a good point to use your grenades. Go through the hole in the wall but don't shoot on the other side, they are friendlies. Make your way up the street in the same direction and take out the enemies coming out of the building to the right. Move up a little and you'll see an enemy vehicle in the distance to the left. Switch weapons to the XM25 to take it out. Clear out the few remaining enemies and make your way into the stock exchange.
Inside the Stock Exchange, head up the escalator to the trading floor. The trading floor is very busy and dangerous. Feel free to make liberal use of grenades and make your way up the left side of the trading floor so that you only have to watch ahead and your right flank. Use the trading stations for cover. When you make it to the back of the room, climb up the stairs in the back. Once you start climbing the second flight, more enemies will come onto the Trading Floor. Take them out and keep climbing, go around the catwalk and up the ladder at the end.
At the top, get ready to fire because there will be a few enemies on the stairs leading to the second tier of the roof. Hurry to take them out and go up the stairs. If you were fast enough, the enemies in this area will be in a terrible position leaving their flank wide open. Clear them out and head up to place the thermite on the Jammer.
After you have your radio back, you'll be attacked by enemies on adjacent rooftops. Soon you'll be given control of a predator drone and be prompted to use it. Use it on the first group of enemies you see and then you'll be attacked by a Hind helicopter. Use it again on the Hind and your ride will show up.
Hop on the chopper and you'll jump into the gunner's seat. Take out the RPGs on the rooftop below you. You'll start moving along and then you'll be attacked by a couple of Hind choppers. Remember to both lead them a little and compensate for your choppers movements. Using the Aim button can help you if you are having trouble keeping steady on them. After you take out two, you'll come to a building under construction and be attacked by a third. Take him out too.
