Call of Duty: Modern Warfare 2/Terminal

Walkthrough
Start out by picking up a weapon with a grenade launcher attachment. Go out of the starting area and use the launcher, you should kill most, if not all of the enemies. Now pick up the rifle, it doesn't really matter which weapon you swap. After you have the riot shield advance until the elevator falls down and then retreat to the starting area, either shoot the enemies as they come down or bash them as the come into the area with the riot shield. You should continue doing this all the way through the mission.

There are 3 more spawnpoints: one at the top of the stairs, after you go past the elevator. One After you reach the first objective indicator and one final one at the top of the stairs. After all of these enemies have been killed, a wave of enemies with riot shields may be at the bottom of the stairs near the exit. if they are then use the grenade launcher and if there aren't then run through the metal detectors to the exit.

If you are having difficulty completing this level, as you kill each group of hostiles, advance to activate the next spawn, then retreat to the start area and kill the hostiles as they come to you. Grenades and grenade launchers can kill most of the incoming hostiles. Claymores can be used to good advantage to thin out the hordes. After you activate, retreat and kill all the hostiles, you can run to the exfil point with no resistance.