The Battle of Troina was an important battle that took place between 31 July and 6 August 1943, as part of the Allied invasion of Sicily during World War II. Forces of the U.S. II Corps, part of the U.S. Seventh Army, under George S. Patton, engaged in fierce fighting around the town of Troina in the central portion of Sicily along the Caronie Mountains. The battle focused around the numerous hills and mountains surrounding Troina which the Germans had heavily fortified and used as bases for direct and indirect fire.

The 39th Infantry Regiment is a parent regiment in the United States Army. Originally organized for service in World War I, the 39th fought in most of the conflicts involving the United States during the 20th century, and since 1990 the 2nd Battalion has served as a training unit stationed at Fort Jackson, South Carolina. The 3rd Battalion was started on 21 October 2015 and a 4th Battalion was added in July 2017.