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Acronym for Special Missions Unit. Noun. A term used to describe highly secretive or classified special forces units, typically used in the United States or referring to US military entities, specifically JSOC (Joint Special Operations Command.) These include: DEVGRU (SEAL Team Six,) CAG (Delta Force,) USAF 24th STS, British and Australian SAS and SBS, and so on. SMUs typically carry out highly secretive or high-value missions vital to securing conflicts. The term can also describe any special forces unit in any military.
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