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 active grade in the U.S. Army again became major general, with all lieutenant generals and generals (except for Pershing) reverted to this permanent rank of major general. Pershing then retired from the United States Army on September 13, 1924, and retained his rank on the U.S. Army retirement rolls until his death in 1948. Four-star generals were reauthorized in 1929, starting with Charles Pelot Summerall. Pershing at this time was no longer on active duty, but his rank was regarded as senior to a full general outside the regular promotion tier. On December 14, 1944, the United States Army established