Monday afternoon, in a pesky drizzle, a handful of people set out 400 small American flags on the empty lot at Second Avenue and 15th Street in memory of the 400 Nebraska men who died in the Vietnam War. It was a prelude to last weekend's 40th -- and final -- annual Nebraska Vietnam Veterans Reunion. "We're all in our 70s and 80s. A lot of men can't get to Lincoln or Omaha for reunions anymore, so the board decided to go out on top," Denny Houska of Kearney said. "On top" means 500 attendees,