Mr. Snrub said:It's a vehicle perk. If you have the alt fire, I think you should have the smoke.
Does the smoke perk give the grenades to the UAV? When I use my alternate fire perk, my UAV gets a machine gun on right click, as seen in that youtube video where the medic and UAV camp-revive that sniper. We're talking about the UAV that you control with the little desktop computer right?