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From: Bryn Dolan firstname.lastname@example.org
Time: 7:41:53 PM
Remote Name: 18.104.22.168
This is just a guess, as you haven't stated exactly where you saw the abbreviation 'SUPY', but I'd say it was short for 'Supernumary'. When applied to soldiers this means that they were taken on the strength of a unit even though that unit already had its full quota of soldiers already serving in it.
Leaders of Anzacs: Anzac officers died at Gallipoli