Ambassador to Switzerland, the Holy See and Liechtenstein. He presented his credentials to the President of the Swiss Confederation, Rudolf Gnägi on 2 April 1971. After a three year stint at Bern, Singh then took over as the High Commissioner of India to Kenya in 1974. Singh spent three years heading the High Commission of India at Nairobi, till 1977. Subsequently, he served as a member of the National Commission for Minorities from 1978 to 1981. Singh also served as the Chairman of the Indian Institute of Technology Delhi from 1980 to 1983 and was a Director of the Grindlays Bank from 1981 to 1988. On 12 December 1989, Singh was appointed Lieutenant Governor of Delhi by the President of India. He served in the position for a year, till December 1990. Promotion to Marshal of the Indian Air Force On 25 January 2002, the Government of India announced that the rank of Marshal of the Indian Air Force was to be conferred on Air Chief Marshal Arjan Singh, DFC, with effect from 26 January 2002, in recognition of the most valuable services to the Air Force and the Nation. The rank is the highest in the Indian Air Force. It is equivalent to Field Marshal and is held for life. The President of India, K. R. Narayanan conferred the Five-star rank on Marshal of the Indian Air Force Arjan Singh and handed the Marshal's baton in a ceremony at the Rashtrapati Bhavan on 23 April 2002. Personal life In 1948, Singh married Teji Singh, a lady of his own community and similar family background, in a match arranged by their families. They were married for 63 years before her death in April 2011. In 1949, their first daughter Amrita was born. Three years later, her brother Arvind Singh was born and the Singhs' youngest child Asha followed another three years later. Teji Singh was the maternal aunt of actress Mandira Bedi. Later years and Death Singh's health declined in his final years, and he frequently made references to growing old and the passing away of many of his friends. In July 2015, then aged 96 and using a wheelchair due to a temporary indisposition, he was among the many dignitaries to lay a wreath at the base of the coffin carrying the mortal remains of former President A.P.J. Abdul Kalam at Palam Airport. He paid his last respects to