Counterintelligence (CI) is one of the most crucial yet unknown military activities in the contemporary world. There are no set standards for CI activities; in fact, CI admits of multiple strategies and tactics. CI has become a very important issue, particularly in the post-9/11 era, to protect troops, information, operations, facilities, and U.S. interests. This entry discusses the history of CI in the United States, the types of military CI operations, and the skills required by military CI specialists.


CI is defined as any activity related to collecting, understanding, organizing, or responding to intelligence threats from other countries or criminal organizations, such as terrorist groups, to avoid sensitive and classified information falling into enemies’ hands. As such, CI has both defensive and offensive aspects. Specifically, ...

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