For one thing, stop using the head to deflect the ball! That looks so dorky. I understand you don't want soccer players catching and throwing the ball. I get that. But what's wrong with just using your hands like in volleyball? Not to catch and throw (which is against volleyball rules too) but to deflect the ball or set up for a kick.
Have the clock run backwards like a normal sport. Stop adding minutes to it to make up lost time. Instead, just stop the clock and resume once play begins.
Those tube socks! What is it, 1977 all over again? Over the calf socks look stupid in 2014. Makes me want to break out a Peter Frampton or Supertramp album. Even NBA players are wearing them just over the shoe. Ditch the stupid socks.
Those are just three of the necessary changes.
That said, good luck to USA against whatever team they are playing in knockout round. Still, a win, tie and a loss is not exactly an inspiring way to make it to the next round. There's just something not right about that.