The mission of CASA is to recruit, train and supervise court-appointed volunteer advocates who provide constancy for abused and neglected children and youth. Court Appointed Special Advocates of San Antonio (CASA) The mission of Child Advocates San Antonio (CASA) is to recruit, develop and lead highly impactful court-appointed volunteer Advocates who provide constancy and support for children and youth who have experienced abuse and neglect. We achieve our mission through advocacy for services, supportive connections, and permanency, while emphasizing family reunification when possible. homes.