WASHINGTON (Reuters) - Top Pentagonofficials and the military command in Iraq contributed to an environment in which prisoners were abused at Abu Ghraib prison, a high-level panel investigating the military detentions has concluded, a defense official said on Tuesday. The independent four-member panel headed by former Defense Secretary James Schlesinger found that Defense Secretary Donald Rumsfeld and the Joint Chiefs of Staff failed to exercise proper oversight over confusing detention policies at U.S. prisons in Iraq and Afghanistan, as well as at the U.S. naval base at Guantanamo Bay, Cuba, according to the defense official. The official, who asked not...