Monguno previously served as the Chief of Logistics at Defence Headquarters and later as Commander of the Nigerian Army Training and Doctrine Command (TRADOC).[5]
Monguno also served as Commander, Guards Brigade, Deputy Commandant, National Defence College, and Chief of Defence Intelligence.[2] Prior to his retirement from the Nigerian army he was considered for Chief of Army Staff position.[6]
Monguno voluntarily retired from the Nigerian Army in September 2013 after turning 56, the age ceiling for Major General in the Nigerian army.[7][8]