Ionia Montcalm Secure and Friendly Environment Child Advocacy Center (CAC) The mission of the Ionia Montcalm Secure and Friendly Environment Child Advocacy Center (CAC) is to protect children by providing multi-disciplinary investigation, assessment, and treatment of child abuse in an environment that is child-sensitive, supportive, and safe. The overriding philosophy of the CAC is to consider first and foremost what is best for the child.