Foreign internal defense

Foreign internal defense (FID) is a term used by the military in several countries, including the United States, France, and the United Kingdom, to describe an integrated, or multi-country approach to combating actual or threatened insurgency in a foreign state. This foreign state is known as the Host Nation (HN) under the US (and generally accepted NATO) doctrine. The term counter-insurgency is commonly used for FID.

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FID involves military deployment of counter-insurgency specialists. According to the US doctrinal manual, Joint Publication 3-22: Foreign Internal Defense (FID), these specialists occasionally get involved with the actual fighting. This doctrine calls for a close working relationship between the Host Nation government and security specialists, which could include diplomatic, information, intelligence, military, economic, and other specialties. A successful FID action is one that leads to the suppression of actual violence. If combat operations are required, Host Nation security forces take the lead. FID is tasked with external support and training where required.

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