Transcript for 11th annual Stand Up For Heroes benefit hosted by Bob Woodruff
Reporter: Down the stairs, backstage at Madison square garden in New York, we were out to find the heroes. It's an honor to meet you. Thank you. Reporter: Retired corporal chianti story, a marine. I was injured in 2010 -- Reporter: He was on patrol with his marine unit. There was an ied in a compound in hell land province. 12 of them stepped over it. But when he did, everything went into a gray haze. It severed his right leg below the knee. Tried to figure out what just happened. And just really tried to calm myself down. And I was going down a dark hole that I didn't want to go down. Reporter: Determined to change that, he quit the pain meds then the rehab, the running, the reaching for the top. Climbing to the summit of Antarctica's mt. Vincent, then climbing kill la man Jairo. A real underachiever. Reporter: An audience waiting. We have our own challenges when we return home. Our own mountains to climb. Reporter: Bob woodruff and his life Lee celebrating him. 11 years now standing up for heroes. After Bob's accident, reporting a roadside bomb 2006. Now years of helping others. It's been the most satisfying thing I've ever done in my life. Reporter: His dedication and those wounded warriors pulling in Jon Stewart every year. You get to see people progress through their recovery and you follow through their ups and downs and it becomes personal. Yeah. Family. That's right. Reporter: Invest Noah join the fight. I think people like Bob make you realize that you can't control what happens to you, but you can control how you react. Reporter: John Oliver, whose own wife an American army medic, veteran of the Iraq war. Don't allow their humility to allow the rest of us -- They don't whine. They're unlike me. I'm a natural whiner. Reporter: Back on that stage, a beaming retired corporate and a message. We are not alone. Reporter: Determined to help the warriors coming home behind
This transcript has been automatically generated and may not be 100% accurate.