In 1944, with the establishment of the rank of fleet admiral, the Department of the Navy specified in a Bureau of Navigation memo that "the rank of Fleet Admiral of the United States Navy shall be considered the senior most rank of the United States Navy". As George Dewey had been deceased for nearly thirty years, no comparison between his rank and that of fleet admiral was made until 1945. At that time, during the preparations for the invasion of Japan, the possibility was raised of promoting one of the serving United States Fleet Admirals to "six-star rank" should the Army take a similar measure by promoting Douglas MacArthur to the rank of General of the Armies.