2015 Headquarters Facilities Master Security Plan - Chapter 13, Controlled Unclassified Information
CUI consists of information that is not classified, but it is so sensitive that it requires special handling and protection. CUI includes Official Use Only (OUO) and its subcategories of Personally Identifiable Information (PII) and Export Controlled Information (ECI), Unclassified Controlled Nuclear Information (UCNI), and Unclassified Controlled Nuclear Propulsion Information (U-NNPI). The procedures for storing, transmitting, and destroying CUI are covered in this chapter. This chapter is maintained by the Office of Classification (AU-60).