At the end Sev from your squad dies. That's not what I found!
Requirements:Sniper attachment. Sev is the first to get on the Wookie turrent(Destroy the ship overhead). Keep playing until it's your turn to get on. Destroy the fleet ship like normal. As you might know the ship is over a circle hole. There's basicly a big wall between your turrent and Sev's. REMEMBER THIS! Sev was first from before, right? So he's on your right. Think of this while your shooting the Rocket turrent. When it blows up get off, get your sniper and zoom to the right where Sev is supposed to be before the level ends. It sounds like Sev died, right? NO! You can see clearly that Sev is still standing. He's spinning on the turrent.
NOTE: Will not always work! Go to the door that will take you the the wookie hanger. Then run to the turrent at the right and get on before the wookie does! Use the left thumbstick and move foreward. It will "slide" across the room in any direction.It's in your control!Well, except if you stop moving the turrent will go back to it's original place. Good moving!
To turn invisible, just press the start button on campaign mode and with your controller press Y, Y, LT, up, X, Black, X, Y. To refill your ammo, do the same except press Y, Y, X, down, LT, RT, LT, up.