THE facility spread out below him, row after row of neatly aligned white tin roofs, looking like candies set against the endless beige of the desert floor. It was called Camp Bucca. To coalition forces in Iraq, it was the primary detention facility for enemy prisoners of war. To Mitchell Gray, then 48 and serving his country for the third time, it was simply the place where the US Army had decided his skills, which included a law degree and a fluency in Arabic, were needed most. He and the rest of his unit, the 45th Infantry Brigade of the...