general of the army

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.
• noun A military officer of the highest rank in several countries that follow the United States military rank system, including Liberia.