In the United States Armed Forces, a six-star rank is a proposed rank immediately superior to a five-star rank, possibly to be worn by the General of the Armies.
Painting of George Washington showing three star insignia. He was posthumously promoted to the rank of General of the Armies of the United States in 1976.
Order 31-3 for promoting George Washington to the rank of General of the Armies of the United States effective 4 July 1976
General Douglas MacArthur showing five-star rank insignia. A proposal in Congress (1955) that MacArthur be promoted to General of the Armies lapsed.
Proposed Congressional resolution authorizing promotion of Douglas MacArthur to General of the Armies. Copy taken from his service record on file at the National Personnel Records Center.
Reichsmarschall was an honorary military rank, specially created for Hermann Göring during World War II, and the de jure highest rank in the Wehrmacht. It was senior to the rank of Generalfeldmarschal
Six-star rank
…First Marshal of the Empire (Kingdom of Italy) Reichsmarschall (Nazi Germany) Taewonsu (North Korea…
Göring's uniform shown in the Luftwaffenmuseum der Bundeswehr in Berlin