Question: What position in the Nigerian Army is the appointer of Mahmood Yakubu retired from?

Context articles: Mahmood Yakubu
Andrew Yakubu
Nigerian Army Day
Mohammed Shuwa
Theophilus Danjuma
Alfred Aduloju
Hassan Katsina
William Walbe
R.M. Dumuje
Muhammadu Buhari

Mahmood Yakubu is a Nigerian academic and current Chairman of the Independent National Electoral Commission (INEC).
 Subject to approval by the Council of State, Mahmood was appointed to office by President Muhammadu Buhari on 21 October 2015, succeeding Amina Zakari, who served as acting chairman.
Andrew Laah Yakubu (born September 10, 1955) is the former Group Managing Director of the Nigerian National Petroleum Corporation.
 He is a Fellow of the Nigerian Society of Engineers; Fellow of the Nigerian Society of Chemical Engineers; a Fellow of the Nigerian Association of Technologists in Engineering; Associate Fellow, Chemical Society of Nigeria and a registered Engineer of the Council for the Regulation of Engineering in Nigeria COREN.
 He was relieved of duty by ex President Jonathan for unknown reasons.
 The anti-corruption agency, EFCC, recently charged Engr Andrew Yakubu to court for false declaration of assets, after the agency found $9.8m in his Kaduna residence.
 Andrew Yakubu has not been found guilty by any court of law for corruption in Nigeria.
The Nigerian Army Day is an annual event typically held on 6 July in honor of members of the Nigerian Army, especially those that took part in the World War I and World War II as well as those that lost their lives during the Nigerian Civil War and the current serving member of the Nigerian Army.
 The celebration so marked the history of the Nigerian Army.
Mohammed Shuwa (September 1, 1939 – November 2, 2012) was a Nigerian Army Major General and the first General Officer Commanding of the Nigerian Army's 1st Division.
 Shuwa commanded the Nigerian Army's 1st Division during the Nigerian Civil War.
 He was murdered in Maiduguri by suspected Boko Haram sect on November 2, 2012.
General Theophilus Yakubu Danjuma GCON FSS psc (Rtd) (born 9 December 1938) is a Nigerian Jukun soldier, politician and multi-millionaire businessman and philanthropist.
 He was Nigerian Army Chief of Army Staff from July 1975 to October 1979.
 He was also Minister of Defence under Olusegun Obasanjo.
 Danjuma is chairman of South Atlantic Petroleum (SAPETRO).
Alfred Aduloju (April 23, 1939 – January 1, 2007) was a Nigerian Army major general who served as commanding officer of a number of Nigerian Army divisions and Commandant of the Nigerian Armed Forces Command and Staff College.
 He was also one of the principal actors in the July 29 1975 coup that ousted then military head of state, General Yakubu Gowon.
Hassan Katsina (31 March 1933 – 24 July 1995) was a Nigerian Army Major General and son of Usman Nagogo, the Emir of Katsina from 1944 to 1981.
 He was governor of the Northern Region of Nigeria from 1966 to 1967.
 During the Nigerian civil war, he was the Chief of Staff, Army and later became the deputy Chief of Staff, Supreme Headquarters under the administration of General Yakubu Gowon.
William Walbe (July 13, 1943 – June 27, 2011), was a colonel in the Nigerian Army who served as the military aide-de-camp (ADC) to General Yakubu Gowon, the third Nigerian Head of State.
Major General Raymond Matthew Dumuje (rtd.)
 "OFR, fss, mni, psc, BEM" (June 24, 1929 – May 9, 2008) was a prominent Nigerian Army officer and businessman.
 He became the first Quartermaster general of the Nigerian Army.
 On February 13, 1976, as a Colonel, he was shot and wounded in Ikoyi, Lagos during the failed "Dimka coup" attempt that saw the assassination of the then Military President, General Murtala Ramat Mohammed.
 The history of the Nigerian Armed forces records this particular event as a mistaken identity for Lt-General Olusegun Obasanjo, the then Chief of Staff of the Nigerian Army.
 He was one of very few to have served both in the Nigerian Army and the Nigerian Air Force.
 He was also a prominent indigene of the "Udu clan" in Delta state.
 He retired as the Director General, Nigerian Army, Army Reserve and Recruitment, in January 1984.
Muhammadu Buhari {'1': ", '2': ", '3': 'GCFR', '4': "} (born 17 December 1942) is the President of Nigeria, in office since 2015.
 He is a retired major general in the Nigerian Army and previously served as the nation's head of state from 31 December 1983 to 27 August 1985, after taking power in a military "coup d'état".
 The term Buharism is ascribed to the Buhari military government.