By Jahmal Corner LOS ANGELES (Reuters) - With a 2018 World Cup berth hanging in the balance, the arrival of coach Bruce Arena has brought a heightened sense of urgency to U.S. Soccer with players eager to rewrite their roles and undo recent failures. When Juergen Klinsmann was fired last November it sent a wave of opportunity throughout the program for players clamoring to impress the new boss. "When you get a new coach everyone has to earn their places again," U.S. forward Jozy Altidore told Reuters on Sunday in Carson, California, where the team is holding their first camp since Arena took over two months ago. More...