Why can't I upgrade? My rank is third lieutenant and I can no longer upgrade my turret and hull. I'm half way to the highest level of upgrade but can go no further, why is this? Does my rank prevent me? If so at what rank can I continue to upgrade? Sorry if these questions are already answered. I looked at the wiki but couldn't find an answer

Make the turrets less accurate. I have a turret that is short range so it means I have to do a lot of leg work to destroy opponents. But it seems when someone has a long range turret they never miss. From anywhere in the field they can hit someone. I don't think this is fair. They should have a cross hair on their screen and unless an enemy is in that cross hair they should not be able to hit them.

Cloak or camouflage There could be a supply that makes your tank either invisible for 30 seconds or makes it blend into the background when the tank is not moving