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DA - Direct Action
SR - Special Reconnaissance
FID - Foreign Internal Defense
UW - Unconventional Warfare
CT - Counterterrorism


18A - Commander
180A - Warrant Officer
18Z - Operations SGT
18F - Intelligence SGT
18B - Weapons SGT
18C - Engineer SGT
18D - Medical SGT
18E - Communications SGT

FID - Foreign Internal Defense

    Foreign Internal Defense (FID). These are operations that involve participation by civilian and military agencies of a government in any of the action programs taken by another government or other designated organization, to free and protect its society from subversion, lawlessness, and insurgency. Both conventional and SOF units have a role and capability to conduct FID missions. SOF's primary role in this interagency activity is to assess, train, advise, and assist Host Nation (HN) military and paramilitary forces with the tasks that require their unique capabilities. The goal is to enable these forces to maintain the HN's internal stability, to counter subversion and violence in their country, and to address the causes of instability. Internal stability forms the shield behind which a nation-building campaign can succeed. Successful FID missions can lead to strategic successes for US foreign policy. FID activities include the following:
  1. HN Military Assistance. These are operations that train HN military individuals and units in tactical employment, sustainment, and integration of land, air, and maritime skills, provide advice and assistance to military leaders, and provide training on tactics, techniques,and procedures required to protect the HN from subversion, lawlessness, and insurgency, and develop indigenous individual, leader, and organizational skills.

  2. Population Security. These are operations that strengthen population security by providing supervision of tactical operations conducted by HN military units to neutralize and destroy insurgent threats, isolate insurgents from the civil population, and protect the civil population. As a subset of FID, designated SOF units may also train select HN forces to perform counterterrorist missions.

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