With his green Army outfit snug around his small frame, Cecil Boswell strode along Green Street every Memorial Day parade. He was the picture of walking history, his steps on the hard pavement reminding spectators of his march across bloodied Europe at the end of World War II. Friends and family mourned Boswell’s death Sunday at 99, remembering the Gainesville resident as more than a local icon and American hero. “He’s a national treasure,” said Bobby Canupp, who grew up a street away from Boswell and attended school with his daughter and niece.