The abbreviations C-UE/EU-C and S-UE/EU-S may be used to indicate the classification level of individual parts respectively of a CONFIDENTIEL UE/EU CONFIDENTIAL or SECRET UE/EU SECRET document or where the full classification marking cannot be inserted, for example on a small removable storage medium. It may be used in the body of text where repeated use of the full classification markings is cumbersome. The abbreviation shall not be used instead of the full classification markings in the header and footer of the document.