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Home About Training Rules Become an Offical Contact More NTHOA is the premier ice hockey officials association serving the DallasFort Worth Metroplex and surrounding areas. Comprised of nearly 400 officials NTHOA fields ice hockey officials with a full range of experience from beginners all the way to professional levels. Most leagues served by NTHOA are affiliated with USA Hockey and operate under USA Hockey as the governing body. All NTHOA officials are trained and certified under USA Hockey and comply with all national regional and local requirements.