William Corcoran Eustis (July 20, 1862 - November 24, 1921) was a captain in the United States Army and the personal assistant to which General of the Armies during World War I, who was was a senior United States Army officer, that had a nickname of "Black Jack"?
John J. Pershing General of the Armies John Joseph "Black Jack" Pershing (September 13, 1860 – July 15, 1948) was a senior United States Army officer. His most famous post was when he served as the commander of the American Expeditionary Force (AEF) on the Western Front in World War I, 1917–18.
Barnard Elliott Bee Jr. Barnard Elliott Bee Jr. (February 8, 1824 – July 22, 1861) was a career United States Army officer and a Confederate States Army general during the American Civil War. He was mortally wounded at the First Battle of Bull Run, one of the first general officers to be killed in the war. During that battle, he was responsible for inspiring the famous nickname for Brig. Gen. Thomas J. "Stonewall" Jackson.