general of the army

Short definition from Wiktionary

Noun

1. 1
   A commissioned military officer of the highest rank in the United States, ranking directly above a general, and corresponding to marshal or field marshal in other countries. A general of the army is equal in grade or rank to an admiral of the fleet.
2. 2
   A military officer of the highest rank in several countries that follow the United States military rank system, including Liberia.