In a press release, Mr Buhari appointed Major-General Abayomi Gabriel Olonishakin as Chief of Defence Staff; Major-General T.Y. Buratai as Chief of Army Staff; Rear Admiral Ibok-Ete Ekwe Ibas as Chief of Naval Staff.
Others include Air Vice Marshal Sadique Abubakar asChief of Air Staff; Air Vice Marshal Monday Riku Morgan as Chief of Defence Intelligence.
The president also appointed Major-General Babagana Monguno (rtd.) as the new National Security Adviser taking over from Sambo Dasuki who resigned last week.
The Chiefs relieved of their appointments on Monday, July 13, include Chief of Army Staff, Lt.-Gen. Kenneth Minimah, The Chief of Naval Staff, Vice Admiral Usman Jibrin and Air Chief Marshal Alex Badeh.