The San Francisco VA Medical Center has played a key role in UC's mission. The VA serves as a referral center for veterans throughout Northern California, and it has been an important teaching hospital for several decades. One third of all UC medical students complete their clinical training at the hospital, which also provides 128 residency positions. It is renowned for its state-of-the-art acute medical, neurological, surgical and psychiatric care. Early in the VA's history, the teaching services were split between UC and Stanford. In the 1950s, after Stanford's withdrawal from San Francisco, the VA Orthopaedic services came completely under the aegis of UC.