While others talked the cheap talk these are the guys who walked the real Vietnam walk. And this Friday, as a new war rages in Iraq, the New Yorkers who served in Vietnam will march across the Brooklyn Bridge to commemorate the 20th anniversary of this city's Vietnam veterans "Welcome Home" ceremony. The event will start at 10 a.m. at Cadman Plaza Park, with an 11 a.m. march across the Brooklyn Bridge to Vietnam Veterans Plaza at 55 Water St. Remembrance ceremonies begin at noon with keynote speakers, followed by a POW/MIA wreath laying, and a reunion center. Although I...