Mort Caplin trained for more than a year to get ready for the invasion. "One of my fraternity brothers from the University of Virginia was killed on that beach." The memories were fresh as the days were long. ... After the war, Caplin became a law school professor. In fact, he had both Teddy and Bob Kennedy at students at the University of Virginia. That's how he met John F. Kennedy, who made him head of the Internal Revenue Service.  Caplin says to this day, President Kennedy is the only president to ever visit the IRS. He welcomed the president to IRS Headquarters on May 1...