The Fifth Army is a designation used by various military organizations, most notably by the United States Army during World War II. It played a significant role in the Italian Campaign, participating in key battles such as the Battle of Salerno and the liberation of Rome. The Fifth Army was known for its diverse composition, including American, British, and other Allied forces. In addition to its World War II involvement, the term "Fifth Army" has been used in other contexts, such as the Italian Army and the Soviet Army. Each iteration of the Fifth Army has contributed to military operations in different historical periods and regions.