Republic of Vietnam Special Police explained

The Special Police (Vietnamese: Cảnh Sát Đặc Biệt – CSĐB) or ‘Police Speciale’ in French, was the Special Branch of the Republic of Vietnam National Police (Vietnamese: Cảnh Sát Quốc Gia – CSQG) from 1962 to 1975.

References

Sir Robert Thompson et al., Report on the Republic of Vietnam National Police, 1971. [available online at http://www.counterinsurgency.org/1971%20Thompson%20Police/Thompson%20Police.htm {{Webarchive|url=https://web.archive.org/web/20130508223411/http://www.counterinsurgency.org/1971%20Thompson%20Police/Thompson%20Police.htm |date=2013-05-08 }}]
Valéry Tarrius, La Police de Campagne du Sud-Vietnam 1967–1975, in Armes Militaria Magazine No. 236, March 2005, Histoire & Collections, Paris, pp. 37–43. (in French)