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.
John Millikin Major General John Millikin (January 7, 1888 – November 6, 1970) was a senior United States Army officer who, during World War II, commanded the III Corps' counterattack toward Bastogne during the Battle of the Bulge in December 1944.