The 1st Infantry Division of the United States Army
Nicknamed “The Big Red One” after its shoulder patch; and also nicknamed 'The Fighting First'—is the oldest division in the United States Army, and has seen continuous service since its organization in 1917. The First Expeditionary Division, later designated the 1st Infantry Division, was constituted on May 24, 1917 in the Regular Army, and was organized on June 8, 1917 at Fort Jay, on Governors Island in New York harbor under the command of Brigadier General William L. Sibert, from Army units then in service on the U.S.-Mexico border and at various Army posts throughout the United States. 4' vertical measurement with red numeral on olive drab color mil spec shoulder patch.