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It was named after John Flynn, founder of the Royal Flying Doctor Service.
In his role as governor, McCusker and his wife serve as the patron for a number of organisations and events, including the Perth International Arts Festival, Telethon, and the West Australian Ballet, and the Western Australian branches of Anglicare, the Royal Flying Doctor Service, the Royal Life Saving Society, the RSPCA, and St. John Ambulance.
He was a doctor with the Royal Flying Doctor Service 1947-48 and was a house surgeon in London, England, 1949-51.