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 officers in the United States Lieutenant Generals and Generals reverted to their permanent ranks of Major General, except for Pershing. Pershing retired from the United States Army on 13 September 1924, and retained his rank of General of the Armies of the United States until his death in 1948. He was later considered a five or six-star general as the result of the creation of the General of the Army rank in 1944. The rank of general was reauthorized in 1929 as a unique temporary rank of the Army Chief of Staff starting with Charles Pelot Summerall. The main purpose of this was to give