Mr Femi Adesina, the President’s spokesman, confirmed this in a statement on Thursday in Abuja.
He was commissioned 2nd Lt. in 1983. He held several command and staff appointments in the course of his successful military career.
He retired in December 2017.
Ndiomu also trained as a lawyer, and is alumnus of National Institute for Policy and Strategic Studies (NIPSS), Administrative Staff College of Nigeria, Badagry, Harvard Kennedy School, and George C Marshall Centre for European Security Studies, among others.