From Halopedia, the Halo wiki
The map takes place in the inner courtyard of the Office of Naval Intelligence Alpha Site in the city, and is described as a medium-sized map, with sniper rifles and turrets situated high up, with a central valley for the purpose of funneling enemies. Midway through a Firefight game on this map, Wraiths will spawn, though hijacking them has been disabled on this map for balance reasons.
The Sniper Rifle spawns on a bench next to a turret, raised platform, to the right of the main staircase near the spawn area. The Spartan Laser spawns at basically the same position as the Sniper Rifle, except to the left of the starting position.
Driving a Wraith
The game is scripted so that as soon as the driver of the Wraith is killed, the Wraith explodes, making it impossible to drive. However, for a split second after the driver is killed, the Wraith can be piloted. Any number of people can accomplish this, however the more, the better:
If done properly, you will become the driver of the Wraith. An ally can climb in and become the gunner. If the driver exits, however, the Wraith will explode. While this is doable alone, it is much harder to keep the Wraith stunned while doing everything else on your own. Also, if you are alone, no one manning the turret will become a problem when the Drones begin to attack.