US Secretary of Defense Leon Panetta (centre L) walks through an honor cordon with Afghanistan Defence Minister General Abdul Rahim Wardak as he arrives at the Ministry of Defence in Kabul June 7, 2012. Panetta said on Thursday the United States was reaching the limits of its patience with Pakistan because of the safe havens the country offered to insurgents in neighbouring Afghanistan. REUTERS/Jim Watson/Pool (AFGHANISTAN - Tags: MILITARY POLITICS)