The 5th started out doing quite a bit of advising work for the CIA (if memory serves) with the Montagnards in Vietnam and earlier in Laos with some of the elements there. It was after Operation Switchback in 1965 that they got more into DA, but that was due to pressure from the Army at large who saw the CIDG program (and others) as a quick source for light infantry and not a local defense force as originally envisioned by the CIA (and most likely the 5th Group as well). And, of course, once SOG got ramped up (and the Greek programs run directly by the 5th Group) they got hauled heavily into DA and never looked back.
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