General-in-chief military forces in the field, as the generals-in-chief did in the 19th century. The rank of "General of the Armies of the United States" was conferred upon General John J. Pershing in 1919 and to Lieutenant General George Washington (posthumously) in 1975 by acts of Congress. Washington's date of rank was retroactively dated to 1799, so that he will always be the senior ranking general of the United States Army. (American general ranks and titles may be a little confusing; however, as reference is cited the public domain information of the Center for Military History of the United States Army
General of the Armies appointment "to the office of General of the Armies of the United States" was never issued. Supporters of MacArthur would lobby for over two decades to have the general promoted to "six star general". As part of the preparation for Operation Downfall (the planned invasion of Japan), the United States War Department began drawing up invasion manpower requirements for a large force organized into several Navy fleets and Army groups. The Army also saw the need for a possible promotion of more officers to the rank of General of the Army, depending on the size of the invasion force, as