Anything that is player controlled by the enemy. Dragonfire, lodestar and Vtol warship are the obvious ones. Sentry gun and AGR can be remote controlled but they dont count when it is AI driven, that is for sure. Not so sure if the player takes control then it is destroyed, might count, might not. RCXD and hellstorm are too fast to lock-on to. Those are all the Player controlled Scorestreaks. Best bet is basically....in a match where you are getting absolutely demolished.
Add a launcher to ur class and always just have it....play game normally and take them out as they come...if u play just fixated on shooting something down that is out of your control u will go crazy. Only thing u can do is switch lobbies if ur not seeing anyone calling in what u need to destroy.