You Blew It Up! Run up the ramp to the west and jump onto the little wall to the north that wraps around to the road leading south. Finally, throw a sticky grenade on top of the Falcon and stand on the grenade.
Fiendly fire won't take it away. Before you begin your switch hunting, eliminate all the enemies in the first area. You may want to take a vehicle along, to serve as a jump-pad like the deployable shield in Halo 3. They appear in some levels and then quickly vanish into thin air if you don't kill them. Halsey's lab at the end of the level.