No idea who the guy is but the Sam Brown, long boots and FF (Fianna Fail) brass cap badge indicates he's an Irish Army Officer.
NCO'c (non commissioned officers) wear ankle boots and a belt without the shoulder strap.
The Irish Defense Forces personnell still wear the same badge on their caps and the same pattern is also on uniform buttons.
'Oglaig na hEireann'. In gaelic means 'The Irish Volunteers'
Oglaig > (soldier) volunteer.
'na hEireann' > of Ireland.