Leonard (Len) Chalmers was attested into the NSW Police Force in June 1940. In 1946 he became a police prosecutor and in 1955 was the Prosecuting Branch delegate to annual conference. He was elected to the Executive and served continuously until 1961. From 1957–1959 he was junior vice-president and from 1960–1961 senior vice-president. In 1966 Len was seconded to the Australian Police College in Manly and remained there as chief instructor until 1966. In 1971 he became the deputy principal at the NSW Police Academy. He retired in 1978 with the rank of superintendent. He died on 18 January 2004.