Top U.S. officials have revealed for the first time the CIA, military and State Department all backed a plan last year to arm Syrian rebels. Defense Secretary Leon Panetta said the plan to provide weapons to vetted fighters was ultimately rejected by the White House. The disclosure came as Panetta and Martin Dempsey, chair of the Joint Chiefs of Staff, appeared before a Senate panel Thursday where they also testified about the fatal attack on the U.S. diplomatic mission in Benghazi, Libya, last year.