John Thornton was just a few weeks away from the end of his tour with the Royal Marines in Afghanistan when he was killed. He was 22.Five years later and his diaries have been published - alongside those of his older brother - who is still in the armed forces.
Their accounts - of life on the frontline - are both honest and emotional, as Richard Jones has been finding out. He spoke to the brothers' parents Linda and Pete Thornton.
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