You'll start off with an Assault rifle and a Plasma Pistol. Move down the hall to where you'll hear Captain Keyes saying, "Chief, don't be a fool. Leave me!" Go through the door and you'll see a Grunt being chased by a unarmed Elite combat form. Kill them both with your Assault rifle. Go to the dead end. If you look to your left, where the Grunt and the combat form chasing him came from - there is an Active camouflage there. Go right then at the opening left. You should see four Grunts. Throw a Fragmentation Grenade. Then go to where they were and go left. There will be two combat forms. Swap your plasma pistol for the shotgun, and go straight to the dead end then right. Take out the Carrier form and its infection forms. Go through the door and jump through the gap. From this point on, Sho