Here is something interesting that I never knew before...
“George Washington is protected from being outranked by any other military officer, by law, even now. If we ever have a 6 star general, Washington would posthumously be promoted to a 7 star general to maintain the top rank.
American Public Law 94-479, passed in 1976, posthumously promoted Washington to "General of the Armies of the United States."
Based on top legal experts interpretation of this law, it means that Washington will likely be considered America's Top General for the eternity of the Republic.”