Ribbon: Royal blue with a central band of scattered gold mimosa blossoms.
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Instituted: 14 February 1975.
Awarded: For achievement and merit in service to Australia or humanity.
Grades: Companion, Officer and Member, plus Medal.
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| Companion (Male) | Companion (Female) | Officer (Male) |
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| Officer (Female) | Member (Male) | Member (Female) |
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Post-nominal letters: Companion - AC Officer - AO Member - AM Medal - OAM |
| Medal (Male) | Medal (Female) |
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