Drone Copter question

#1ilikeubettyPosted 3/22/2011 11:21:20 AM
So sometimes it works, other times not. I understand that the white diamond appears and then I hit R1 to get it to turn red but sometimes I have someone right in my sights inside the rectangle using L1 to zoom and it doesnt work. Any thoughts?
Also, how do you upgrade to the other more advanced vehicles and drones? Is it kills ranks or both?