in October 1950, Knox received further training ashore and at sea in both Australia and the United Kingdom. He married on 1 December 1956, to Margaret, with whom he has two sons and a daughter. The following year, he completed the Long Course in Torpedo and Anti-Submarine Warfare in the United Kingdom, being awarded the Ogilvy Medal as dux of the course. In 1960, he was posted to the Aeronautical Research Laboratory in Melbourne as the Anti-Submarine Warfare Project Officer. In this role, he assisted in the development of the Ikara ASW Guided Missile System. Service as a staff officer with the Navy Office in Canberra followed from 1964. , Knox and Mike Hudson. In 1966 Knox was appointed executive officer of the destroyer. He served two years with Perth, which included a seven-month deployment to Vietnamese waters from September 1967 to April 1968. Promoted to commander later that year, Knox was appointed Director Underwater Weapons at the Navy Office before being made the inaugural commanding officer of the destroyer escort in 1971. From 1972 to 1973, he attended the United States Naval War College in Newport, Rhode Island, following which he was made captain and appointed commanding officer of the guided missile destroyer. His next posting, in 1975, was to the Strategic and International Policy Division in the Department of Defence. His service in this role occasioned attendance at the third through to the sixth sessions of the United Nations Law of the Sea Conference as part of the Australian delegation. In 1979, Knox returned to the United Kingdom to attend the Royal College of Defence Studies. On graduation, he was promoted commodore and appointed to command the aircraft carrier. He was next posted as Director-General Naval Plans and Policy in 1981. In 1982 Knox was promoted to rear admiral and appointed Chief of Naval Operational Requirements and Plans. He briefly served as Deputy Chief of Naval Staff in 1984, before he was made Flag Officer CommandingHM Australian Fleet in 1985. In the Queen's Birthday Honours list that year, Knox was appointed an Officer of the Order of Australia for his service in the former two positions. After almost two years in command of the Fleet, Knox was posted to Canberra as Assistant Chief of Defence Force in January 1987 for six months, before he was promoted vice admiral and appointed Vice Chief of the Defence Force in succession to Air Marshal Ray Funnell, who had been appointed Chief of the Air Staff. From 1988, Knox occupied a dual role as VCDF and Commander Joint Forces Australia. Advanced to a Companion of the Order of Australia in July 1989, Knox retired from the RAN that September after 42 years of service and was succeeded as VCDF by Vice Admiral Alan Beaumont.
Retirement
Knox has served on the board of directors of several companies since his retirement from the RAN, including Australia Sonar Systems, Oceanic Capital Corporation and Thomson-CSF Pacific Holdings. Recreationally, he enjoys tennis, traveling and, having obtained a pilot's license in 1988, flying. He is also an active Legatee in the Sydney area, having joined the organisation in 2000. Knox lives in Lavender Bay, a harbourside suburb on Sydney's North Shore, as at 2016.
