Oscar S. Hartig was born on March 13, 1897 near Newburg, Warrick County, Indiana. He was a farmer. He entered service on September 6, 1918, Boonville, as a machinist. Sent to Camp Taylor, Kentucky where he was assigned to the 60th Company, 15th Training Battalion, 159th Depot Brigade. He died of influenza on October 13, 1918 at Camp Taylor. He was buried in Greenwood Cemetery, Chandler, Warrick County, Indiana.