Army sergeant Jamie Partington, 31, gave the vital organ to his sister Kylie, 29, after a kidney that was previously donated by her father began to fail.
Sgt. Partington flew is now recuperating at home over Christmas but hopes to be fighting fit and back on the frontline with his Army colleagues within two months.
'People say I'm very brave for donating to my sister, but the fact I've passed all the tests in order to donate means I'm in very good health,' he said.
'My sister never has been. The fact that she was told at ten years old that her kidneys are failing and there is no cure - that's brave.
'I've always known I wanted to donate a kidney to my sister, for as long as I can remember she has been one of the strongest people I know.
Read more: http://www.dailymail.co.uk/news/article-2078418/Soldier-donates-kidney-sister-flying-Afghanistan.html#ixzz1hZWqYVGp