To my mind there never was a COIN v Something else debate. I can't speak for COL Gentile, but I don't think anyone has ever spoken against COIN. They spoken about biasing training and resources so heavily towards COIN (Security Operations) that Combat Operations skills and resources suffer.
Add to that the perversion of the "Security mission" into a "nation building mission" and I think you have still think there is a lot left unresolved.
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