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« on: Friday 09 May 25 16:57 BST (UK) »
He's from a mounted unit, based on the ammunition bandolier, so probably not Infantry. He's a lance corporal and has two good conduct stripes indicating he had been serving for at least 6 years. The initials on his left shoulder would tell us his regiment or corps but unfortunately they are too unclear to read. At a guess they might be RFA standing for Royal Field Artillery, but equally they could be RE for Royal Engineers, or indeed several of the cavalry regiments. The badge above the stripe of his right arm could be significant, but again it's too indistinct to make out what it is.
As you may know, around two thirds of all the service records from WW1 were destroyed in a fire during WW2, but even so there are around 100 records of one sort or another, inc luding more than 40 medal index cards, for C or Christopher Barry, which have survived. Many of these will be duplicates or refer to the same man, but even allowing for this, without further collateral information it's going to be hard to find out more about his service.
Do you have any further details about his date of birth or where he came from in Ireland? For example there was a Sergeant Christopher Barry born 11 Jan 1879 of Franzeska Street, Dublin (although he is possibly too old to be the man in the photo) and another born in St Christopher's, Dublin in 1884, connected to 132 Cork St, Dublin (possibly the address of his next of kin?). However both of these men were in the Royal Dublin Fusiliers, an infantry regiment, so unlikely to be wearing a cross belt.