Spotted a 2013 book in a private library last week: The Flechas: Insurgent Hunting in Eastern Angola 1965-1974 by John P. Cann. Lots of B&W photos and the author is a SME on Portugal's colonial wars.
Link (US):http://www.amazon.com/The-Flechas-In.../dp/1909384631
Link (UK):http://www.amazon.co.uk/Flechas-Insu.../dp/1909384631
The UK publishers blurb is helpful:http://www.helion.co.uk/africaatwar-...1965-1974.html
Yes they are different; mixed reviews, but I cannot recall any books on this unit in English. The Flechas are seen by some as the model for both the Rhodesians and South Africans - using local manpower, skilled in tracking, although the flechas did not use "turned" guerillas.
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