Pattadakal Venkanna Raghavendra Rao was an Indian civil servant, writer and the sixth defence secretary of India. He assumed office on 21 November 1962, the day the Sino-Indian War ended and held the position until 3 April 1965. He was the author of three books, "India's Defence Policy and Organisation Since Independence", "Defence without drift" and "Red Tape and White Cap". The Government of India awarded him Padma Vibhushan, the second highest Indian civilian award, in 1967.
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