If you are thinking of returning, don't. I just did and completed research on the tank I'd already put a few hours of grinding in to, on completion of research, another tank pops up and I need to research that before I can buy the one I'd already researched.

If you are thinking of returning, don't. I just did and completed research on the tank I'd already put a few hours of grinding in to, on completion of research, another tank pops up and I need to research that before I can buy the one I'd already researched.