Master Sergeant Caleb Bernard Green III (born September 8, 1964) is an American solo vocalist with the United States Army Band. An accomplished performer, particularly of the US national anthem, Green is often called upon to sing at important sporting events, diplomatic functions and military ceremonies. Green and former military member, Bob McDonald are the primary national anthem singers for the Washington Capitals. His most notable anthem performance was at the 2009 "We Are One" presidential inauguration concert at the Lincoln Memorial in Washington, D.C.. Prior to this his most notable outing was onstage in the TNT production "Christmas in Washington 2008", in which he sang "O Holy Night". He is also a member of Voices of Service, an accapalla group formed by him and three other milita