The National Registry of Emergency Medical Technicians (National Registry) is the non-profit Emergency Medical Services (EMS) Certification organization for the United States. Its mission is to provide a valid, uniform process to assess the knowledge and skills required for competent practice by EMS clinicians throughout their careers, and to maintain a registry of certification status. All 50 states recognize National Registry certification, while 48 states use National Registry certification as a basis for licensure. EMS clinicians at the Emergency Medical Responder (EMR), Emergency Medical Technician (EMT), Advanced EMT (AEMT) and Paramedic levels work in a variety of capacities throughout the nation as first responders, in hospitals and medical facilities, in schools and colleges, with the police and military and in many other settings.