Drive an AA Wraith

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In Halo 3 and Halo 3 ODST's campaign, a glitch allows players to drive an AA Wraith (and a "Normal" Wraith in Halo 3: ODST) in any level it appears in. The glitch is a timing-related exploit that allows a player to kill the vehicle's driver and enter the cockpit before the Wraith self-destructs.

It is to be noted, however, that the Wraith will self-destruct once you leave it. Avoid leaving the Arbiter or any Marine in the turret; they will die when the vehicle self-destructs, and the deaths will be counted as betrayals.

Walkthrough

 * 1) Find an AA Wraith on any level where one can be boarded. The Covenant is an excellent level for the purpose.
 * 2) Kill the gunner, if necessary.
 * 3) Stand on the front hatch of the Wraith and melee it off. Weapons like Rocket Launchers or Spartan Lasers with a good melee force will smash open the hatch in one hit without killing the driver.
 * 4) *On higher difficulties or with the Tilt skull on, you will probably have to board the Wraith and melee the hatch until it falls off, as a normal melee attack won't even dent the hatch.
 * 5) After the hatch is off, melee the driver to knock his helmet off. Do not kill the driver, or the glitch will fail.
 * 6) If you boarded the Wraith, jump off of it. Jump on top of the Wraith without boarding it. Once you see the pilot's head, crouch and position yourself so you do not see "Hold RB to board Wraith".
 * 7) Melee the driver's armor off. After that, while holding RB, kill the driver, preferably with a Head Shot-capable weapon or continuing to melee him to death. Once he dies, you will immediately enter the Wraith.

There are some problem areas with this glitch. In particular, hijacking an Anti-Air Wraith becomes nearly impossible if the Wraith notices the player. If the player manages to jump onto the Wraith without being shot or splattered, the Wraith will continuously drive and back up in a circular motion, attempting to escape. Such erratic movements make it extremely difficult to keep a steady aim on the driver's head, and impossible to position oneself so that the "Hold RB to board Wraith" prompt does not appear. A player can counter this by stopping the vehicle with a Plasma Pistol overcharge or a Power Drain.

Cooperative Walkthrough
In Co-op, two players (Person A and Person B) can cooperate to perform the glitch. On Local play, it does not matter which player acts out which role. On Xbox Live, however, only the host can act as Person A; if a client player acts as Person A, then at best they may end up "driving" the vehicle after it has exploded. This method addresses the problem of accidentally boarding the Wraith when trying to drive it. By boarding the Wraith, Person B prevents Person A from accidentally doing the same. This guarantees that when Person A holds RB, they will enter the vehicle and pilot it.
 * 1) Find an Anti-Air Wraith.
 * 2) Get Person B to board the Wraith, while Person A stands at its front or side and holds RB.
 * 3) Person B should melee the driver and gunner normally.
 * 4) As soon as the driver and gunner are killed, Person A will immediately enter the vehicle.

Note that the Wraith will still explode when Person A exits it -- even if another player is manning the turret.

Explanation
Anti-Air Wraiths cannot normally be piloted because of a function Bungie attached to the vehicle: when the driver dies or exits, the vehicle self-destructs. This is why killing the driver before completing the glitch prevents it from working, and why the vehicle self-destructs when a player exits the cockpit.

The glitch that allows players to pilot an Anti-Air Wraith is a timing exploit. If a player kills the driver while holding RB, they will enter the vehicle the moment the driver dies -- and before the vehicle self-destructs. The span of time at which the vehicle is pilot-less will be so brief that the game will fail to notice it, and thus will not destroy the vehicle.

Trivia

 * When piloted, the vehicle uses a temporary reticule that seems to be used for vehicles that lack unique reticules. This same reticule could be seen in several ViDocs and in the Halo 3 Beta, when using locked vehicles like the standard Wraith. It is possible that the Anti-Air Wraith is drivable because it is a modified version of the standard Wraith; it is also possible that Bungie once intended for it to be usable by players, but removed this capability due to the vehicle's immense firepower.
 * Notably, there is an animation that is seen only when the player gets out of the vehicle - the turret being contracted into its compartment. However, if the player starts The Covenant at Rally Point Alpha and gets a loading point (past the Banshees) and goes to Theater, the player will see the two Anti-Air Wraiths spawn with a gunner, but without the driver. The turret will be contracted, and strangely, the Anti-Air Wraith will not explode.
 * If hijacked, the main weapon can be fired at a rate much greater than is seen during normal gameplay; all one needs to do is button-mash on the right trigger. This is most likely because there was no wait between shots programmed, since it was not intended to be driven.
 * When doing this glitch on higher difficulties, Heroic and Legendary on Halo 3 (all difficulties on Halo 3: ODST), overcharging the plasma pistol will disable the Wraith, causing the Wraith to be still, giving the player a good opportunity to successfully hijack the Wraith. When the player attempts to hijack the Wraith, and the Wraith is not distracted, the Wraith will move erratically, and it is almost impossible to hijack the Wraith.
 * Unlike the Wraith's plasma turret, there is no apparent crosshair for the AA Wraith's turret.
 * Anti-Air Wraiths are quite rare in Halo 3: ODST. In ODST, all Wraiths, Anti-Air or otherwise, are rigged to explode when the driver dies or exits. This glitch must be performed to drive a Wraith at all (except for the levels Kikowani Station and Coastal Highway).
 * Hijacking the standard Wraith in Firefight makes it far easier to unlock the Vidmaster Challenge: Endure achievement. The Wraith is very vulnerable to Fuel Rod Guns, the Catch skull, and other Wraiths, however.