USA National Karate-do Federation is the national governing body (NGB) of karate for the United States Olympic Committee and as such is the official Member National Association (MNA) of the World Karate Federation (WKF) in the United States. The organization has complete authority over all decisions regarding U.S. national junior and senior team selections for World Karate Federation events. The tournaments that are held by the USA-NKF are big and nationwide and many famous martial artists attend the events. The USA Open is one of the largest international Black belt-only events in the world.