and chairman (1952–1955). Turnbull (Light Blue) – Alex Turnbull – a founding member of the School Council, serving 1923 to 1947, and an elder at St Margaret's Church in nearby Turramurra. Co-curriculum Army Cadet Unit (KGSACU) The Knox Grammar School Army Cadet Unit (KGSACU) comprises 1200 members, ranging from recruits (RECs) to Cadet Under Officers (CUOs). The KGSACU is an ACU within the NSW 2nd AAC BDE. Participation is compulsory from the start of Term 4 Year 8, through to the end of Term 3 Year 9 for attendees of Knox Grammar School, and offers voluntary participation for attendees at the Ravenswood School for Girls from Term 4 Year 8. After the completion of basic recruit training in their first year, cadets may decide to either discharge from the Unit, or attend a Promotion Course to attempt to attain a higher rank and/or continue into a Senior or Recruit company. The Unit participates in combined Annual Field Exercise (AFX) at the end of Term 1, and holds its own Junior, Senior, and CUOs Promotions Courses during August each year. Additionally, the KGSACU holds ceremonial parades for the Old Knox Grammarians Association (OKGA), an ANZAC Day Parade to commemorate ANZAC Day (though held several weeks after the day itself), and a Passing-Out Parade at the end of the cadet year to farewell the Year 12 members at the conclusion of their service to the Unit. Sport Knox is a member of the Combined Associated Schools (CAS), and plays competitive sport against the five other member Schools namely, Barker College, Cranbrook School, St. Aloysius College, Trinity Grammar School and Waverley College. Trial and pre-season fixtures are played against the GPS and ISA Schools. Students may represent Knox in a variety of inter-school sporting fixtures played each Saturday throughout the term. The Intra-School sporting programs includes House carnivals, Standards and Inter-School competitions open to all boys. Participating in sport at Knox is compulsory in both the winter and summer sporting seasons. Knox plays 5 weeks of sport against GPS schools, and then 5 weeks of sport against CAS schools CAS premierships Knox Grammar School has won the following CAS premierships. Athletics (29) - 1929, 1931, 1933, 1935, 1937, 1938, 1939, 1957, 1959, 1961, 1962, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1983, 1984, 1985, 1992, 2001, 2003, 2004, 2006, 2007, 2008 Australian Football - 2021 Basketball (9) - 1978, 1979, 1980, 1997,