Navy type commanders were permanently assigned administrative officers which oversaw the development, deployment, and in some cases operational activities of the various classes of German naval vessels. Due to cross jurisdiction with the Navy group commanders, who tactically commanded all vessels at sea, some type commanders were little more than ceremonial officers who held a title with little authority. Others, such as Karl Dönitz who commanded the German U-boat force, exercised near total independence and held enormous authority, both operationally and administrative.