SAN ANTONIO -

,Army veteran Brad Davis, 46, has been granted his dearest wish: the chance to walk again without pain.

He received knee replacement surgery free of charge through an organization called Operation Walk USA and Baptist Health System.

Davis has dealt with injuries sustained during a military training accident in 2005.

"I ended up fracturing both knees, both ankles, both shoulders, my spine -- I had a lot of fractures," he said, "It was pretty bad."

The U.S. Department of Veterans Affairs covered multiple surgeries but told him they couldn't do anything for his knees for another 15 years.

Fortunately, Operation Walk USA stepped in.

Davis was granted total knee replacement surgery on his left knee, a procedure that can cost $15,000 to $30,000, free of charge. 

The procedure was performed by orthopedic surgeon Dr. Amanda Marshall at St. Luke's Baptist Hospital.

"We're indebted to all those who volunteer their time, from the nurses to the scrub techs to the anesthesiologist, the radiology folks, everyone who gave of themselves, of their time, to improve one person's life," Marshall said.

Just three days after surgery, Davis said he could feel a big difference. He does have physical therapy ahead but he was already walking around the hospital floor.

He was extremely grateful to receive the life changing gift, just in time for the holidays.

"I can walk my dogs now (and) get back to doing that, as well as grocery shopping, just the regular normal stuff that you don't think about until you can't do it," he said.

Operation Walk USA offers knee and hip replacements at no cost to anyone who doesn't have insurance and can't afford surgery.

Just this week, the organization performed more than 320 joint replacements across the U.S.

For a list of recent stories Eileen Gonzales has done, click here.