American troops continue their torture tour in Afghanistan : At a time when the conventional Afghan military and police forces are being killed in record numbers across the country, the regional forces overseen by the C.I.A. have managed to hold the line against the most brutal militant groups, including the Haqqani wing of the Taliban and also Islamic State loyalists. But the units have also operated unconstrained by battlefield rules designed to protect civilians, conducting night raids, torture and killings with near impunity, in a covert campaign that some Afghan and American officials say is undermining the wider American effort to strengthen Afghan institutions.

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