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Ivan Castro lost his sight to a mortar attack while serving as a U.S. Army Green Beret in Iraq, but he didn't let that stop him from returning to active duty and participating in marathons and extreme races around the world.

Castro joined Bill Hemmer on "America's Newsroom" to discuss how he rose from the darkness of despair to reclaim his soul and his purpose.

"When told, 'You're going to be blind for the rest of your life,' I was trying to find what was my next step, because all my dreams and goals had crumbled," Castro explained.

He revealed that his wife helped him realize that life would go on, and he just had to pick up the pieces and move forward.

Castro said that he had a wake-up call when he reflected on his fellow soldiers who lost their lives or suffered more debilitating physical or mental injuries.

"I realized that although I had lost my sight, there was still much more that I could do if I put some time and effort into it."

Learn more about Castro's amazing journey in the clip above and in his book, "Fighting Blind."

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