"He stood tall amongst his fellow men as an experienced hand who willingly stepped forward to take on the difficult task of clearing routes, and he gave the less experienced soldiers in his section huge confidence.
"He leaves behind a strong impression and his memory will inspire us. I am hugely proud of him, and humbled by his sacrifice."
Defence Secretary Bob Ainsworth praised Guardsman Janes' "exemplary service".
"I was very sorry to learn of the death of Guardsman Jamie Janes, a soldier who, I'm told, had given exemplary service since joining the Army at 16 and had a promising career ahead of him," he said.
"He had already shown his bravery, professionalism and dependability on a previous tour of Afghanistan and was an integral part of his company.
"He also clearly cared deeply about his family and my thoughts are with them at this very sad time."
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