WASHINGTON (AP) — More than 100 free courses have opened at the National Park Service’s Wildhorse Golf Course in the western U.S. The courses have been open to people who have cerebral palsy since at least the early 1990s.

The program began with about 50 courses at Yellowstone National Park, but that has now expanded to about 600, and the park plans to open 1,600 by the end of the decade, the NPS said in a statement.

The National Park service says it has more than 10,000 active members and volunteers.

A spokesman for the service didn’t immediately respond to an email seeking comment.

Wilderness Club of Arizona, a nonprofit organization, has offered a course at its Meadows Golf Course, which has been open since 1993, and is open to anyone who meets the requirements of the National Association of the Deaf.

The club has a reservation at the park, but the reservation does not guarantee a course.

The National Deaf Association said it was not aware of any courses in the Nissen-Lange-based Wildhorse golf courses program.

The NPS’ Wildhorse program was established in 1984 as a response to a challenge to accessibility.

The program provides free, on-site course-management services and training, to the blind and visually impaired.

The service also has a “free disability certificate” program that includes certificates of completion for courses, and has been offering free courses at the parks for about 20 years.

The American Society of Clinical Pathologists says it supports the inclusion of free services for people with intellectual and developmental disabilities, but said in its statement that it would have preferred to see the program expanded.

The Associated Press contributed to this report.