cardio-pulmonary resuscitation (CPR), and automated external defibrillator (AED) usage. The first responder training is considered a bare minimum for Emergency medical services (EMS), also known as ambulance services, pre-hospital care, or paramedic services, are emergency services that provide urgent pre-hospital treatment and stabilisation for serious illness and injuries and transport to definitive care. They may also be known as a first aid squad, FAST squad, emergency squad, ambulance squad, ambulance corps, life squad or by other initiali Ambulance personnel are generally professionals and in some countries their use is controlled through training and registration. While these job titles are protected by legislation in some countries, this protection is by no means universal, and anyone might, for example, call themselves an 'EMT' or a 'paramedic', regardless of their training, or the lack of it. In some jurisdictions, both technicians and paramedics may be further defined by the environment in which they operate, including such designations as 'Wilderness', 'Tactical', and so on. A unique aspect of EMS is that there are two hierarchies of authority, as the chain of command is separate to medical authority. Certified first responders may be sent to provide first aid, sometimes to an advanced level. Their duties include the provision of immediate life-saving care in the event of a medical emergency; commonly advanced first aid, oxygen administration, cardio-pulmonary resuscitation (CPR), and automated external defibrillator (AED) usage. The first responder training is considered a bare minimum for emergency service workers who may be sent out in response to an emergency call. First responders are commonly dispatched by the ambulance service to arrive quickly and stabilize the patient before the ambulance arrives, and to then assist the ambulance crew. Some EMS agencies have set up volunteer schemes, who can be dispatched to a medical emergency before the amb In countries such as the United States, Japan, France, South Korea and parts of India, ambulances can be operated by the local fire or police services. Fire-based EMS is the most common model in the United States, where nearly all urban fire departments provide EMS and a majority of emergency transport ambulance services in large cities are part of fire departments. Examples of this model are the New York City Fire Department (FDNY) and the Baltimore City Fire Department. It is rare for a police department in the United States to provide EMS or ambulance services, although many police officers have basic medical training (such as Nalaxone use and CPR). One notable example is New Orleans Emergency Medical Services, which was formed as a hospital-based service, was operated by the New Orleans Police Department from 1947 to 1985, and is currently operated by the New Orleans Health Department and the New Orleans Office of Homeland Security and Emergency Preparedness, separate from the New Orleans Fire Department. Charities or non-profit ambulance departments operate some emergency medical services. They are primarily staffed by volunteers, though many also have paid personnel. These may be linked to a volunteer fire service, and some volunteers may provide both services. Some ambulance charities specialize in providing cover at public gatherings and events (e.g. sporting events), while others provide care to the wider community. The International Red Cross and Red Crescent Movement is the largest charity in the world that provides emergency medicine. (in some countries, it operates as a private ambulance service). Other organisations include St John Ambulance, the Order of Ambulance personnel are generally professionals and in some countries their use is controlled through training and registration. While these job titles are protected by legislation in some countries, this protection is by no means universal, and anyone might, for example, call themselves an 'EMT' or a 'paramedic', regardless of their training, or the lack of it. In some jurisdictions, both technicians and paramedics may be further defined by the environment in which they operate, including such designations as 'Wilderness', 'Tactical', and so on. A unique aspect of EMS is that there are two hierarchies of authority, as the chain of command is separate to medical authority. Certified first responders may be sent to provide first aid, sometimes to an advanced level. Their duties include the provision of immediate life-saving care in the event of a medical emergency; commonly advanced first aid, oxygen administration, cardio-pulmonary resuscitation (CPR), and automated external defibrillator (AED) usage. The first responder training is considered a bare minimum for emergency service workers who may be sent out in response to an emergency call. First responders are commonly dispatched by the ambulance service to arrive quickly and stabilize the patient before the ambulance arrives, and to then assist the ambulance crew. Some EMS agencies have set up volunteer schemes, who can be dispatched to a medical emergency before the ambulance arrives. Examples of this include Community First Responder schemes run by ambulance services the UK and similar volunteer schemes operated by the fire services in France. In some countries such as the US, there may be autonomous groups of volunteer responders such as rescue squads. Police officers and firefighters who are on duty for another emergency service may also be deployed in this role, though some firefighters are trained to a more advanced medical level. Some volunteer-based EMS agencies or rescue squads may sponsor the training of volunteers or offer subsidized costs for EMT training courses. Besides first responders who are deployed to an emergency, there are others who may be stationed at public events. The International Red Cross and Red Crescent Movement and St John Ambulance both provide first aiders in these roles.