What are the controls for Battlefield Bad Company 2 Beta UAV Chopper for Xbox 360?

I have gotten in the UAV a couple of time (Mainly stole it from another guy who was a complete hog with it Heh heh) And I could not figure it out. Every time I tried to shoot a rocket, a red thing would point out where it would go but the missile never fired. I would need to hold it down for like a minute for it to shoot and then I saw people firing it like every 3 freakin seconds!? So I got pissed and gave that Chopper hog his way and gave it back. I also would like to know how to fire a Chain gun from the UAV also. That reeeeeeally pissed me off so if you can help out, Thank you very much :)