Prior to joining the Badgers was a member of the USA Hockey-sponsored National Development Team. He won a gold medal at the 2005 IIHF World U18 Championships in the Czech Republic collecting a goals and three assists in six games at the championship. Skille collected 24 goals, 31 assists and 55 points in 54 games for the U.S. National Under-18 Team during 2004–05 and was whistled for 76 penalty minutes during the season. In international play as a NDTP player, Skille had tournament-best seven points to lead the Americans to first place at the Four Nations Cup in Ann Arbor, Michigan and led tournament with eight points as U.S. team placed first at Five Nations Tournament in Tjörn, Sweden.