They sure were not captured wearing uniforms.
Still, this guy hurt our cause for no good reason. It is not as if he was trying to get important information out of the people he abused.
They were for the most part common criminals who were sent to Abu Ghraib for rape, theft, or other ordinary crimes or were rounded up in the vicinity of car bombings. Most were released afterward. Criminals don't have to wear uniforms to get access to civil rights.