Chemical Biological Incident Response Force, United States

Chemical Safety and Hazard Investigation Board (USCSB), United States

Chemical Safety: Emergency Responses

Chemical Warfare

Chemistry: Applications in Espionage, Intelligence, and Security Issues

Chernobyl Nuclear Power Plant Accident, Detection and Monitoring

Chile, Intelligence and Security

China, Intelligence and Security

Chinese Espionage Against the United States

Church Committee

CIA (United States Central Intelligence Agency)

CIA (CSI), Center for the Study of Intelligence

CIA Directorate of Science and Technology (DS&T)

CIA, Foreign Broadcast Information Service

CIA, Formation and History

CIA, Legal Restriction

Cipher Disk

Cipher Key

Cipher Machines

Cipher Pad

Civil Aviation Security, United States

Civil War, Espionage and Intelligence

Classified Information

Clinton Administration (1993–2001), United States National Security Policy

Clipper Chip

Closed-Circuit Television (CCTV)

Coast Guard (USCG), United States

Coast Guard National Response Center

Code Name

Code Word