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The most recently available definitive document is THE ORDER OF WEARING AUSTRALIAN HONOURS AND AWARDS, 25 September 2007. Amongst other things, it states:
 * Post-nominals within the Order of St John are not recognised as notified in the Governor-General’s media release of 14 August 1982.

The items in this list fall into a number of groups:
 * 1. Those within the Australian System of Honours and Awards.
 * 2. Those conferred by The Sovereign in exercise of the Royal Prerogative.
 * 3. Those which recognise public and professional service and achievement.
 * 4. Imperial awards.

Note that honorary awards of the Order of Australia are not made to Australians.