Anzac Day has become the nation’s choice as its pre-eminent national day, writes Mark Lopez.Children at Anzac Day dawn service,Shrine of Remembrance, Melbourne,April 25, 2007. (Photo by Mark Lopez).When the last post sounded in the pre-dawn darkness, I discreetly looked around me. I saw solemn faces, and heads respectfully bowed. Family groups huddled closely together in contemplation.Nearby, a young woman leaned back to nestle comfortably in the secure embrace of her boyfriend. Both were hushed…