Unlimited Ammo - Laptop Sentry Gun - Air Force One - Antiterrorism: Perfect Agent [3:55]
1. Locate and retrieve equipment
2. Locate President
3. Get President to escape capsule
4. Secure Air Force One flight path
5. Detach UFO from Air Force One

Another difficult one, you'll need practice before beating it. First, make sure that you start out in the cargo bay (beat Air Base by walking up the ladder under Air Force One), then go into the room in front of you and knock out the technician. Grab the key card and activate the switch to bring up the cargo. Grab the suitcase and leave the room. Head into the kitchen and knock out the steward.

Go up to the food chute and activate the switch. Get inside the small elevator and wait until it takes you up to the ground level. Go into the room in front of you and head up the stairs. Once at the top, go left and enter the door at the end of the corridor to meet the President. Once the talking and cutscene end, switch to the Combat Boost and go out of the room. Head down to the end of the corridor and activate the boost. Take out the Laptop Gun, open the door and blast the guard in the control room. Head into the cockpit and blast the two guards there.

Go back down the stairs and go left, back into the main area of the plane. Shoot the two guards in the first passenger room and continue on. Before entering the second passenger room, use another Combat Boost, then open the door and quickly blast the two Mr Blonde guards. Rush in and then to the rear of the plane, blast the guards in the way, and head down the trapdoor.

Go through the door at the bottom of the stairs and blast the guard there. Open the door to the escape capsule and let the President run in there. Go back up to the room where the UFO is attached and throw a timed mine in the tube. Wait for the explosion, and then wait for the pilots to stabilize the plane before the mission ends. This cheat is difficult to get, you'll need practice first.

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