Question: The Indian Air Force's rank structure is based on that of the Royal Air Force, the highest rank attainable in the Indian Air Force is Marshal of the Indian Air Force, conferred by the President of India, MIAF Arjan Singh is the only officer to have achieved this rank, he was an Indian Air Force marshal who served as Chief of the Air Staff from 1964, to which year?
Sentence (from "List of Royal Australian Air Force air marshals"): In 1965, Sir Frederick Scherger became the first officer to be advanced to air chief marshal, one of only four members of the Royal Australian Air Force to obtain this rank as of June 2014.
Relevant evidence: No