Trevor Greene's recovery has been long, hard and is far from over.

"I call it the marathon of baby steps," he says. "There are fewer defeats than victories, for instance, yesterday I sat up on my own for the first time"

The marathon began in 2006 when Trevor, a reservist from Vancouver, was stationed in Afghanistan, leaving behind his child and fianc� to help re-build the war torn country.

During reconstruction talks with tribal elders Trevor's life changed forever, when a man came up behind him with an axe.

"He cried out 'Allah Akbar' and then dropped the axe with full double handed swing into the top of Trevor's head," recalls one of Trevor's comrades. "I can remember Trevor's eyes rolling into the back of his head and just dropping."

It was a fellow soldier that shot and killed the attacker.

"I got up took my weapon off safety, fired two rounds into him and he just stood there and stared at me," he says. "It took probably another ten shots to drop him."

With severe brain injuries, Trevor was flown back to Canada in a coma. Doctors gave him little chance of recovery.

"They had warned me up front, he likely won't recover and I just thought we'll see about that," recalls fianc� Debbie Lepore. "I just had this thought in my mind that he will prove you all wrong."

And that's exactly what Trevor did.

With Debbie at his side, he spent nine hours a day -- six days a week -- overcoming both the physical and emotional pain.

Greene says the agonizingly slow process is frustrating.

"Lack of progress and in a wheelchair and my hands and arms don't do what I want them to do," he says.

"To see where he is now, compared to where he was two and a half years ago or even a year ago, or even two months ago makes it all worth while," says Debbie.

Trevor's next goal is to stand on his own and eventually even walk again. It's a goal that doesn't seem so impossible, when the seemingly impossible has already been overcome.

"Somewhere it was said I'm meant to live," says Trevor, "I'll spend the rest of my life searching for the reason."

Despite his personal struggle, Trevor says he supports the Canadian mission in Afghanistan, and believes our troops are making a difference to people's lives there.

The full length documentary 'Peace Warrior' on Trevor's incredible story airs Saturday, December 13th on CTV.

With a report from CTV British Columbia's John Fenton