Vairo returned to the United States men's national ice hockey team as its head coach at the Ice Hockey World Championships from 2000 to 2003. His best result was fourth place in the 2001 IIHF World Championship, which was the closest the team came to a medal since the bronze at the 1996 Men's Ice Hockey World Championships. He was an assistant coach on the national team in ice hockey at the 2002 Winter Olympics, held in Salt Lake City. The team won a silver medal, its first medal in Olympic ice hockey since the 1980 Winter Olympics. He also coached the United States men's national junior ice hockey team in 2003 World Junior Ice Hockey Championships.