US Army veteran Kevin McCluskey caddies for Graeme McDowell in the Par 3 event at the Masters eight years after having both legs blown off in Afghanistan and also losing all sight in his right eye.
McCluskey, who is from Philadelphia and served with the 101 Airborne Division in Afghanistan, said that he had been left "speechless" by McDowell's offer.
2010 US Open champion McDowell, whose two-under-par total left him six behind winner Jimmy Walker in the Par 3 event, said that McCluskey's battles "puts life and golf in perspective".
"I hit a roadside bomb. I lost both my legs. One above the knee and one below the knee. I have a fake hip and a fake pelvis," said the US Army veteran.
"I lost a lot of motion in my wrist but I'm getting it back to normal now.
"I had shrapnel go through my face so I'm blind in my right eye but other than that I'm good. My mind is good.
"I've a beautiful family, a beautiful wife and many friends at home. Everybody has just helped me get back to where I need to be."