Can be set to 'yes' or 'no' and determines whether or not this VehicleTypes is not considered a vehicle. This is meant to prevent vehicles getting an 'enter' cursor over them when an InfantryTypes with VehicleThief=yes set is ordered to attack them (thus preventing them from being stolen). Appears to work correctly in Yuri's Revenge; use of this tag on a VehicleTypes appears to prevent: InfantryTypes with VehicleThief=yes set from hijacking them, survivors emerging from the unit if it is destroyed, and being repaired by repair weapons (Repair IFV's RepairBullet, for example). Service Depots and the like can still repair VehicleTypes with NonVehicle=yes.
