The following provides more details that may be useful in understanding the context of the nomination process.
Helpful references
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Information on the Humanitarian Overseas Service Medal is available from the following websites
The Department's site provides information on eligible groups and how the medal is awarded as well as the history and medal design.
The Governor-General's site includes links to relevant regulations and declarations.
The Department of Defence's site provides information on the medal and it's design as well as providing a list of clasps and a defence specific application form.