ADVERTISEMENT President Muhammadu Buhari on Tuesday appointed Lucky Irabor, an army major-general, as the new Chief of Defence Staff, following the resignation of the former service chiefs. The position of Defence Chief is usually occupied by a four-star general. President Buhari made the surprise announcement after years of defending his refusal to change the service chiefs he appointed in 2015 and who had long passed the public service retirement age. Nigerians had blamed the reverses suffered by the security forces in the war against the Boko Haram insurgency in the North-east on Mr Buhari’s refusal to rejig the military command and bring in new hands.