The USL became the proving ground for the use of a Video Assistant Referee in four games at Red Bull Arena this season, as the league made history as the first professional competition to utilize the system.

MLSSoccer.com was on hand at the New York Red Bulls II vs. Louisville City FC game in August as the system was employed for the second time in league action. Check out the behind the scenes footage, and interviews with officials from the game, and PRO Referees.