The National Archives, for the first time ever, released a list of documents related to the assassination that are still shielded from public view.More than five decades after the assassination of President John F. Kennedy, thousands of government files detailing the activities and testimony of shadowy spies, long-deceased witnesses and others with possible knowledge of the events remain shielded from public view. The government gave a first-ever peek at what's still out there Thursday, as the National Archives released a list of the 3,063 documents that have been "fully withheld" since JFK's murder in Dallas on Nov. 22, 1963....