Nations Aikikai teaches authentic Hombu style Aikido. Nelson Andujar 6th dan, is the head instructor, and has studied under Yamada Sensei for more than 40 years. Yamada Sensei is head of the United States Aikido Federation (USAF) and was a direct student of the founder of Aikido, O'Sensei, as well as an uchi deshi (live in student) at the Hombu dojo, Japan.