Air Marshal Tahir Rafique Butt took over as the new chief of the air staff of Pakistan Air Force (PAF) at a ceremony held here at the Pakistani Air Headquarters on Monday, Geo News reported. Outgoing Air Chief Marshal, Rao Qamar Suleman formally handed over the PAF\'s Sword of Command to Air Marshal, Tahir Rafique Butt. Both the outgoing and incoming air chiefs were presented separate guards of honour to formally mark the change of command. Born in 1955, Air Marshal Tahir Rafique Butt received his early education at PAF Public School, Sargodha. Subsequently, he joined Pakistan Air Force and graduated from PAF Academy, Risalpur in March, 1977. Meanwhile Lieutenant General Zaheerul Islam has assumed the charge as new Director General (DG) of Inter Services Intelligence (ISI) from today. Zaheerul Islam has replaced Gen Shuja Pasha who retired on Sunday, March 18 after the completion of his tenure.