The 81st Infantry Division ("Wildcat") was a unit of the United States Army in World War I and World War II. The insignia of the 81st Infantry Division is allowed to be worn by the 81st Regional Support Command, which continues to use the same shoulder patch insignia. According to the U.S. Army Center of Military History, the lineage of TO&E units can not be perpetuated by TDA units; however, Army Reserve commands, Regional Support commands and others have been allowed to wear the shoulder sleeve insignia of like-numbered divisions of an earlier era.