It is simple. Open Halo Map Tools 3, open any level with Wraith tanks. select the Wraith, and you will see where it says "seat name" it says "wraith-driver" change it to B-driver. Start the level, and get an empty Wraith. (you will have to overturn it so the elite falls out. I recommend turning another vehicle or something into wraith, so you don't have to knock the elite out.) It will say, press 'E' to enter driver seat of Banshee. press 'E', and you're in!

Unlike playing as an Elite, you can get back out!
Now start blowing things up!
