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.
Alexander Macomb (general) Alexander Macomb (April 3, 1782 – June 25, 1841) was the Commanding General of the United States Army from May 29, 1828 until his death on June 25, 1841. Macomb was the field commander at the Battle of Plattsburgh during the War of 1812 and, after the stunning victory, was lauded with praise and styled "The Hero of Plattsburgh" by some of the American press. He was promoted to Major General for his conduct, receiving both the Thanks of Congress and a Congressional Gold Medal.