After leading the U.S. boxing team in warm-ups yesterday, Marine Corps Sgt. Jamel Herring demonstrated the unique style and speed that may earn him an Olympic medal. "I'm definitely an underdog here," said Herring, a light welterweight who surprised several opponents at the U.S. Olympic Team Trials with quick footwork and his ability to dodge punches. "It's like a hit and run. It's like a game of tag -- I'm hitting, and I'm gone."