The Ministry of Defence has told ITV News that the Pembrokeshire-based soldier killed in Afghanistan today had been in the country for less than a month.
His tour was due to last for 9 months.
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Cloudy with patchy rain or drizzle, possibly turning heavier for a time.
Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.