Unit Identification Code

The Unit Identification Code (UIC) is a six character alphanumeric code that uniquely identifies each United States Department of Defense entity.

The UIC is often used on various paperwork to assign a soldier to a specific company in which they fall under.

For example, in the US Army, the parent unit designation breaks down as such: [2]

For example, the parent Battalion unit for the Army will use "AA."

It remains unclear as to the origins of UIC's, but they are assigned to all military units and organizations, as well as federal government organizations.