Sixty years after the tragic assassination of President John F. Kennedy, the man who leaped onto the back of the presidential limousine in a desperate attempt to shield the president and first lady is finally opening up about that fateful day. Clint Hill, the Secret Service agent assigned to Jacqueline Kennedy, was forever marked by the events of November 22, 1963. Remembering John Fitzgerald Kennedy today. #NeverForgetJFK #Nov221963 #FiveDaysInNovember https://t.co/SoG7RV3xx6 ...