Jump out of the Warthog vehicle and on to the tank.
First crash into the Wraith with the Warthog.
Ubisoft has included a nice variety of genres in their mini games, from first person shooting (albeit with plungers instead of bullets) to racing (on a warthog), speedy arcade action to strategic puzzles.
When the Wraith's cannon aims at you, go back to the Warthog and shoot at it with your plasma weapon.
So you do and the Warthog ramps and launches into the hanger and everyone goes tumbling out.