Shoot the enemies at the end of the tunnel and then BOOM. Use your night vision and clear the room. Make sure you watch for elevated enemies. Go through the tunnel into the larger room beyond. Watch for enemies from the front and try to make your way over to the blue room on the left. This will leave you with fantastic flanking position. From here, eliminate as many enemies as possible and then jump down through the window. Take cover behind the raised platform and work your way to the left side tunnel. Empty the tunnel and wait for the door to open.
Enter the next room which is pretty slim pickings. Again, flank up the left side and kill the enemies in the vehicle bay. Wait for your allies to move up and then drop through the window behind them and make your way to the door on the left. Kill the man at the top of the stairs and go through the door. Once outside, clear the lower area and the hop the railing on the right to make your way downstairs. Move up to the next set of barriers and hunker down. Make liberal use of the Predator drone. It will respawn frequently so just keep using it to clear as many enemies as possible.
Use the Predator to continue making forward progress and make your way to the west side. Once there, you will lose your predator drone. Clear enemies and move forward. Wait for the air support to knock down the front door. Run-through and rescue the girl. Go out the far side of the cave and take out the enemies on the bridge below. Once clear, move to the bridge and repel down. At the bottom move forward and start shooting over the shoulders of the President. Be careful not to shoot him but try to thin the crowd coming at you.
The doors will shut on you so take your time and be careful clearing this room. Head up the stairs and stand above the safe room. Plant the explosives and you will drop into the room below. There will be a few enemies to kill but be careful because one of them has the president in front of him so aim well. After you take them all out, head back up out of the room the way you came. You have to hold this position for 30 seconds and then you'll have to make a run for the far side. Use your Tic-grenades and make a run for it. Once you go down you'll need to hold off as many troops as you can but you won't take damage.
