general of the army 
noun
The highest rank of officer in the US army, above general.The ‘five star’ ranks of general of the army or field marshal, or equivalent, have been generally abolished except in time of full-scale war....
- Hence, Gen. Ulysses S. Grant proposed in 1866 to place the Adjutant General under the control of the commanding general of the army, who was to be responsible directly to the president through the secretary of the army in all army matters.
- He looked no short of an officer of great honor or perhaps a general of the army.