All officers that wore the 5 Star Rank were World War II commanders. Five star officers are advanced to that rank only in time of war,[at one time I read they also must command at least 100,000 + troops, [but I could not find it for proof this time on the internet]. A Brigadier generally commands 3 brigades approx. totaling 3,000. A Major General commands 20,000-30,000 and a Lt. Gen usually 60,000 -70,000 troops.
The list of 5 Star officers;
Fleet Admiral William D. Leahy advanced 15 December 1944
General of the Army George C. Marshall advanced 16 December 1944
Fleet Admiral Ernest King advanced 17 December 1944
General of the Army Douglas MacArthur advanced 18 December 1944
Fleet Admiral Chester W. N imitz advanced 19 December 1944
General of the Army Dwight David Eisenhower advanced 20 December 1944
General of the Army Henry H. Arnold advanced 21 December 1944
Fleet Admiral William Halsey Jr. advanced 11 December 1945
General of the Army Omar Bradley advanced 20 September 1950 see note
General of the Air Force Henry H. Arnold advanced 7 May 1949 see note
note:
In the Bradley case it came during Korea – remembering President Truman fired General MacArthur.
In the case of Arnold, the Army Air Corp. became the US Air Force during Korea and he transferred keeping his rank – becoming the only person to wear 5 Stars in two branches of military service.
Additional;
Two other United States officers held the office of Generalof the Army and Admiral of the Navy.
General of the Army was General Pershing- advanced 3 September 1919 – when advanced there was no insignia at the time. He was given the chose of having the 5 stars in the circle made or wearing 4 stars but instead of silver they were gold color - he chose the later being the only General or General of the Army to wear 4 gold stars. See below
When Admiral George Dewey was advanced 24 March 1903 he also continued wearing only 4 stars, but designed his own 'shoulder boards'. Both officers above received additional pay. see below
Maximum Numbers of Generals;
Army 230 total Generals 7 four stars
Air Force 208 9 four stars
Marines 60 4 four stars
Navy 160 6 four stars
Coast Guard less than 30 1 four star
No more than 25% of active duty flag [general and/or admiral] officers can have more than 2 stars in all branches.
Chief of Staff and Commandants serve 4 years.
Vice Chiefs and Vice Commandants usually retire after 2 years
A 4 Star retires after 40 years military [64 years old], but the Sec. Of Defense can defer them to age 66 and the President can defer them to age 68.
Brigadier General
Major General
Lieutenant General
General
General of the Army
General of the Armies
Note spelling - General of the Army and General of the Armies
Armies is the designation for General of ALL military of the United States.
Now the two excepts for insignia;
Admiral George Dewey:
General Pershing;