Mountains Beyond Mountains: Part I, Chapter 1

I learned, in this chapter, about who Paul Farmer is and also what Tracy Kidder is doing in Haiti. Kidder is with a Special Forces group led by Captain Carroll, who is known by the 150,000 Haitians he watches over for letting a suspected decapitator of a Mayor free. Through Paul Farmer, Kidder learns more about Haiti, possibly more than what Carroll could say. Kidder learns about corruption in Haiti when he learns of the decapitator(Nerva Juste)'s release. Political violence is suggested when Kidder explains that 20,000 soldiers had been sent to Haiti to reinstate democracy and strip power from the military junta. It puzzles me about how a high junta official received training from the US Army's School of Americas. Does the US regret anything about that?