Halo: Combat Evolved/Assault on the Control Room

The first thing you see when Foehammer drops you off is a Grunt running into the door. Quickly run to the nearest gun turret and get in. As soon as the door opens, start blasting the Covenant that come out. There's an Elite in there as well, so watch yourself. If they get out of your range of fire, get out and finish them off with your Assault Rife or Pistol. After killing them all, grab any plasma weapons that you fancy (if you fancy them that is) and head for the door.