Maj. Gen. Geoffrey D. Miller, the former commander at the detention center at Guantánamo Bay, Cuba, who also helped set up the interrogation operation at Abu Ghraib prison in Iraq, is declining to testify further about harsh interrogation practices and will retire from the service, Army officials said Thursday. General Miller, 56, decided this week to invoke his right not to give testimony that might incriminate him and will not answer questions in court-martial proceedings against two soldiers who are accused of using dogs to terrify detainees at Abu Ghraib, Maj. Michelle Crawford, a military lawyer representing the general, said Thursday by e-mail. Full Story