This is a very unusual image and clearly one that was used to identify police and military figures for future reference. A line of people stand in honour of a funeral or some form of remembrance. And while the photographer, perhaps unintentionally, captures their image it is later used to identify them. Who might have been privy to such information and why might it have been used?
Collection: Irish Political Figures Photographic Collection
NLI Ref: NPA PHOP1
You can also view this image, and many thousands of others, on the NLI’s catalogue at catalogue.nli.ie
Owner: National Library of Ireland on The Commons
Source: Flickr Commons