Among the options you provided, the institution that is typically not established by the constitution in many countries is the Emergency Services.
National Courts, the Auditor General, and Defense Forces are often established through constitutional provisions or statutory law, whereas Emergency Services (such as fire, medical, and police services) are generally organized under local or state governance structures and might not have a direct provision in the constitution itself. However, this can vary by country, so it's always advisable to check the specific constitution of a particular nation for the most accurate information.