Trained under Ravelo, Woodruff, and Aleman, Jamel would win gold in the 2012 Olympic Trials defeating multiple nationals champions. In the first round of the tournament he defeated Tommy Duquette, Mike Reed in the second round, Pedro Sosa in the semi finals, and in the finals he defeated Pedro Sosa again. He would eventually move on to the 2011 AIBA World Championships but lose to China in the first round, forcing him to fight for his spot again at the 2012 USA Boxing Nationals. After winning the Nationals, he went on to compete in the Americas Qualifiers where he would win a bronze medal and earn a slot at the 2012 games. Herring qualified for the 2012 Olympics. Jamel, along with the entire US boxing team, only had two weeks prior to the games to train together as a complete team. He was the only United States Marine to compete at the London Olympics and the first active duty marine to qualify for the US boxing team since 1992.