Guide to marking documents

United States. National Imagery and Mapping Agency

The national security of the United States depends on many things. including the security of its information. Throughout our history. the national interest has required that certain information be maintained in confidence in order to protect our citizens, our democratic nstitutions. and our participation within the community of nations. This innovation is called national Security Information and is classified to afford its protection. This guide provides guidance on identifying and marking classified information. The guidance is based on Executive Order 12958, Classified National Security Information: and Director of Central Intelligence Direetives (DCIDs). It is intended for use by NIMA original and derivative classifiers and administrative personnel who prepare the final producL Classification markings serve several purposes. They alert holders to the presence of classified...