The Army Unit Identification Code is a six-digit alphanumeric code that is used to uniquely identify each army unit. This includes active, reserve and National Guard units, all of which fall under the Armed Forces branch.
Army Unit Identification Codes are not used outside of military applications. The Office of the Secretary of Defense, or OSD, maintains a database of all non-classified Unit Identification Codes, which requires special permission and registration to access. This database is open to analysts and program managers who use the UIC database to develop applications that support military operations. Unit Identification Codes may change if a unit goes through a transformation process, and the Army provides support for those changes.