After attending the Imperial Defence College in 1960, he served as the Air Officer in charge of Administration at Air Headquarters. In 1963, he took over as the Deputy Chief of the Air Staff and then as the Vice Chief of the Air Staff. Singh assumed office as the Chief of the Air Staff, on 1 August 1964. For his distinguished service in commanding the IAF during the Indo-Pakistani War of 1965, he was awarded the Padma Vibhushan and in 1966 became the first IAF officer to be promoted to Air Chief Marshal.