In a year of historic anniversaries, one passed this weekend mostly without notice. America’s media and its political leaders had barely anything to say about Saturday’s 15th anniversary of Operation Neptune Spear, the heroic raid carried out by Navy SEALs to kill Osama bin Laden. Let’s concede that a 15th anniversary deserves less attention than the major milestones that lie ahead. Still, bin Laden’s death was our last great moment of national unity when Americans rallied around the flag to