Air Defense Bunker

Air Defense Bunker is the first level in Quake 4.

Revolving around the start of the battle of Stroggos. The U.S.S. Patton-class cruisers are intercepted by Strogg defenses. Rhino Squad flies down to the planet, but is shot down. Matthew Kane awakes in the dropship unconscious. The rest of Rhino Squad is scattered, and Kane fights alongside members from other squads, hope to get back to his squad.

Introduction
After some gruesome opening cutscenes, the squad you are in got hit and have to crash land. You start in the crash site with your Blaster, go and talk to Morris. After you're done, go over to Anderson, the Medic. He'll heal you (your health is always 72 at the start). Continue on inside the Bunker and you'll come across some Guards, you can let the Marines kill them if you want, but that will take a bit long. For more aggressive player, charged blaster can be helpful, you can take cover and charge the Blaster, then pop out and shoot at the guard. Go through a door and you'll see a Marine being dragged away by a Grunt, a new monster. Go up to the door and proceed through it, a Machine Gun is down in front of you, as soon as you get it, a Guard drops down in front of you. Kill it, and go down this hall. There are more Guards, you need to kill them all for the door ahead to open. You'll see the previously seen Grunt taking down another Marine, Kovitch, but is blasted by Kovitch's Shotgun alternatively, you can save him before he does anything. Go through a few doors, and you come to a hall with pipes to your left. A Grunt busted a few to stun you, then comes around. Go through this door where more Marines are. You now have to get back to Anderson and help this injured Marine.

Escort the Medic
Follow the route back to where you first started, you will come across the first Berserker, which many more will be encountered throughout the game. Aim for their head with your machine gun, there is no enough time and space to let you use Blaster. Now, after escorting Anderson back to the Marine, go through the door to meet Cortez, Rhino Squad's Sharpshooter. Go through the door up ahead to end the level.

Weapons

 * Blaster
 * Machine Gun

Items

 * Small Medkit
 * Small Armor Vest
 * Clips

Characters

 * Master Sergeant Marian Bidwell (Intro)
 * First Lieutenant Scott Voss (Intro)
 * Corporal William "Billy" Rhodes (Intro)
 * Sergeant Dell Morris
 * Private First Class Jeremiah Anderson
 * Corporal Johann Strauss (Intro)
 * Corporal Alejandro "Alex" Cortez
 * Lance Corporal Nikolai "Sledge" Slidjonovitch (Intro)
 * Medic Metcalf
 * Private Webb
 * Private Dees
 * Private First Class Kovitch
 * Private Marshall
 * Private Chase
 * Private First Class Hillstrom
 * Sergeant Miller
 * Corporal Pierce

Enemies

 * Guard
 * Light Guard
 * Machine Gun Guard
 * Grunt
 * Berserker
 * Harvester (Non-combat)