General of the Armies of the United States Washington

General of the Armies of the United States is the highest possible land-based rank in the United States military hierarchy, equal to a Generalissimo. The rank of General of the Armies has only been bestowed twice in the history of the United States Army and only once in an active duty capacity. The rank is superior to that of General of the Army (note the difference between the singular and the plural of the two ranks).
The only people in United States history to hold the title General of the Armies were John J. Pershing, who held the official title "General of the Armies" and, posthumously, George Washington, who was appointed to the official title of "General of the Armies of the United States".