highest rank in the world is : SECRETARY GENERAL OF UNITED NATION
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The highest rank is Field Marshal, currently held by Queen Elizabeth's husband, the Duke of Edinburgh. It is a purely ceremonial role. Following that is the rank of General which is held by the Chief of the Defence Force (a role that rotates through the heads of the three services) and then Lieutenant General. Therefore if the current Chief of the Defence Force is from the Army then the highest Army rank is General, otherwise it is Lieutenant General.
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Andrew Jackson held the highest military rank of Major General in the United States Army.
Five Star General - GOAF (General of the Air Force) this is reserved for wartime only. Four Star General - during peacetime this is the highest ranking officer in the Air Force. But if you're talking about highest officer rank that is NOT a General rank. It would be Colonel.
Generalfeldmarschall was the highest regular general officer rank in the German Wehrmacht, comparable to NATO rank codes OF10
Lieutenant General (OF-9) As Field Marshal is the highest rank, General must be the second highest and Lt-Gen the third.