EXCLUSIVE: For much of the past seven years, President Bush and Vice President Dick Cheney have waged a clandestine operation inside the White House. It has involved thousands of military personnel, private presidential letters and meetings that were kept off their public calendars or sometimes left the news media in the dark. Their mission: to comfort the families of soldiers who died fighting in Afghanistan and Iraq since the Sept. 11 terrorist attacks and to lift the spirits of those wounded in the service of their country. On Monday, the president is set to make a more common public trip...