Invictus athlete: Losing my arm wasn't a massive low point
10 September 2014 Last updated at 05:29 BST
On 8 May 2007, Lewis Edwards was five days away from being flown to Iraq with the Second Battalion The Royal Welsh.
But being involved in a road accident meant his right arm had to be amputated above the elbow and his first tour of duty was brought to a halt.
Lewis, 26, says participation in sport has greatly helped him on his road to recovery as it has given him something to focus on.
Newsbeat spoke to the swimmer during a final training session before he competes at this year's Invictus Games on 14 September.