the aim of the tanks is the same as the AI tanks in game , ground forces can capture and hold airfields if within the area of cap, Im not to sure wether they are able to inflict damage to a 2ndary base or 2ndary target objective and will be testing this ingame ot find out if they can or can not do any damage to bases but other than that I dont really see a point in the tanks as the distance to travel on a map to get to a base is quite far , the maps on the Tank Beta are alot smaller at the moment and you are able to kill the objectives on these maps but like I said , there not the same maps we see in main game , more tester maps for beta.