A. Major-General Johnson Aguiyi-Ironsi
B. General Yakubu Gowon
C. General Murtala Mohammed
D. Major-General Olusegun Obasanjo
General Johnson Thomas Umunnakwe Aguiyi-Ironsi MVO, MBE was a Nigerian Army general who was the first Military Head of State of Nigeria. He seized power amidst the ensuing chaos following the 15 January 1966 military coup, which decapitated the country's leadership.