There are also Equitation classes, in-hand breeding classes and "flat" or pleasure classes. It is currently the fastest-growing of the national level shows for Arabian horses. At the National level, placings are decided by panels of three judges who each write their own placings separately, with final numbers calculated by computer, combining the results of all three judges' "cards". The AHA has promoted endurance riding and sponsors a National Distance Championship. They also offer two Trail Ride Vacations each year, one at Fort Robinson State Park, in Crawford, Nebraska, and another at the V6 Ranch in Parkfield, California. Both the purebred and half-Arabian/Anglo-Arabian registries are housed within AHA. For a time, the AHRA had been embroiled in a controversy that had resulted in the creation an independent registry for the purpose of exporting American-bred Arabians to other countries. However, AHA resolved the dispute and in 2007, AHA was admitted to the World Arabian Horse Association (WAHO), making it the official recognized registry for the purpose of worldwide import and export of Arabian horses. The Purebred Arabian stud book is actually owned by the Purebred Arabian Trust (PAT), which grants AHA an exclusive license to manage the registry. Policies and procedures for registration of animals are set by the Registration Commission, a joint committee made up of representatives of both PAT and AHA. The membership of AHA has no authority over the purebred registry other than via its ability to elect representatives to the commission. The Half-Arabian/Anglo-Arabian registry is owned by the AHA. The Arabian Horse Association created a 501(c)(3) foundation in 2007 that supports youth scholarships, education, and research efforts to uncover the roots of diseases affecting Arabian horses. The International Arabian Horse Association (IAHA), though a newer group, was the better-known of the two organizations that merged to create the AHA, because of its role in sanctioning horse shows, developing rules, and licensing judges. IAHA had worked with the American Horse Shows Association (then AHSA, now USEF) to create approved All-Arabian horse shows and propose rules for the Arabian division of AHSA . It was founded in 1950 By 1957 and 1958, it had organized the first U.S. and Canadian national championships. Its membership peaked at over 32,000 members in the 1980s. It entered into a merger agreement with the AHRA in 2002, and in 2003, the AHA officially came into being.