U.S. Masters Swimming (USMS), founded in 1970, is a nonprofit membership national governing body for masters swimming, an organized program of swimming for adults. The program began when the first National Masters Swimming Championships were held on May 2, 1970 at the Amarillo Aquatic Club pool with a few dozen swimmers. Captain Ransom J. Arthur, M.D., a San Diego Navy doctor, had persuaded John Spannuth, President of American Swimming Coaches Association, that the event would give older swimmers (ex-competitors and beginners) a goal for keeping physically fit. Arthur's mission of encouraging adults to improve fitness through swimming has grown over the years into a nationwide organization that currently includes more than 60,000 adult swimmers.