 The Bureau of Steam Engineering was added to the bureau system, testimony to the U.S. Navy's conversion from sail to steam.Most important from the standpoint of Army-Navy cooperation in joint operations, the set of officer ranks was redefined so that each rank in the U.S. Army had its equivalent in the U.S. Navy.The establishment of the ranks of admirals implied also a change of naval doctrine, from one favoring single-ship operations to that of employing whole fleets.