The drone is buggy and heavy. Sometimes you'll go invisible, the drone will just spin in circles or just despawn out of nowhere. I don't use it because it just weighs way too much to be worth it.
Corporals had it previously and messed it up enough to have it removed. I highly doubt the Captains will bring it back for ranks below Sgt. and I would prefer if they didn't due to the abuse that would ensue.