The GDI War Factory
Like in every other C&C game out there, the War Factory is responsible for building vehicle units. It's level only dictates the repair time. Evidently,
the higher the level, the lower the repair time. There's not a whole
lot else to it other than it makes a good stopper to put in front of your more valuable structures. Try to keep it as high level as possible as early as possible, if you wait too long, it takes forever to catch up.