Oh oh oh how do I get one of those Beef? 
Easy, the anti-gravity drive is available on all tanks, however, you have to do certain things to activate it.
1. Drive randomly around a field shooting at airplanes paying no attention where you are going.
2. Drive into a field gun bunker to start the charging sequence.
3. Start cussing as your tank begins to lift off and flip violently.
4. Get a teammate to bring you supplies to flip your tank back over after it comes to rest on it's top.
5. Go into the film viewer and pause / take a screen shot when the tank is upright and at the highest point in it's flip.
6. Post it on the forums for others enjoyment.
