The National Hot Rod Association (NHRA) is a drag racing governing body, which sets rules in drag racing and host events all over the United States and Canada. With over 80,000 drivers in its rosters, the NHRA is considered one of the largest motorsports sanctioning bodies in the world. The association was founded by Wally Parks in 1951 in the State of California to provide a governing body to organize and promote the sport of drag racing. The first nationwide NHRA sponsored event was held in 1955, in Great Bend, Kansas. (Typical for the era, this race was held on a World War II-constructed training air field.) The "Nationals", which now comprise 24 events each year, are the premier events in drag racing that bring together the best cars and drivers from across North America. The U.S. Nationals are now held at O'Reilly Raceway Park at Indianapolis in Clermont, Indiana and are officially called the Mac Tools U.S. Nationals. Winners of national events are awarded a trophy statue in honor of founder Wally Parks. The trophy is commonly referred to by its nickname, a “Wally”.