Need help with ADVANCED BATTLEGROUNDS the future of combat?

I am at the third level i think and that one guy dexter or something like that just escaped with this shuttle and the girl tells me to hit it and then my character says he needs a heavy weapon for that and she says whatever just do it and ive run around everywhere trying to find something to use but they would not let me get in the walker or speeder and ive tried to shoot it with all my guns i actually ran out of ammo lol and nothing works i dont know what to do =[

please help
 
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