He doesn't look old enough to have a driver's license let alone drive a tank on the front lines. Years ago I attended the official first flight of the restored Lancaster bomber in Hamilton, Ontario and they read the names, ages and mission records of anyone in the audience who had flown bomber command in WW2. The oldest air crew member was 23. Most of them were 18 or 19.

I assume that the helmet protects Junior's head from all the hard, pointy stuff inside the tank cockpit.

That helmet, and that type of tank did not last too long.