Nigeria's president appoints new defence chiefs - presidency
Hours earlier, Buhari sacked his previous top defence staff.
The change of defence chiefs was widely anticipated because Buhari, a former general who was inaugurated on May 29, has made crushing militant Islamist group Boko Haram his top priority.
(Reporting by Felix Onuha; Writing by Alexis Akwagyiram; Editing by Hugh Lawson)