The U.S. Military has over 100 bases spread throughout the world, would we be better off to close some down?

Almost 80% of the bases are there to help the corporate bottom line. They build them, supply them, and are the reasons for their existence. Then they over charge for any service and every commodity. Tens of billions of your tax dollars go into corporate coffers every year instead of services and improvements here at home. Is there any good reason to have over 100 military bases around the world?