Bryshon Nellum, who was shot in the legs four years ago and endured three operations to return to the track, was selected to carry the United States flag in Sunday's closing ceremony of the London Olympics.

Nellum, 23, was chosen by a vote of U.S. athletes, according to the U.S. Olympic Committee.

"I'm humbled by this incredible privilege," Nellum said in a statement. "Four years ago, I wasn't sure I would ever run again, and now I'm leading Team USA into the closing ceremony of the Olympic Games.