When controlling drones, you can't give your squad any commands(if you're also the squad leader), or you can't request supports(artillery, CAS, etc) from the drone control. This is annoying and it limits the usefulness of drones.

For example, I tried calling laser guided CAS on my laser which was directed at an enemy infantry team, but I couldn't. I had to switch to my soldier, open the map, try to guess where the squad was(since the drone did not make them appear on the map), and place the CAS order there.