Generally, vehicles count as an ambulance if they can transport patients. However, it varies by jurisdiction as to whether a non-emergency patient transport vehicle (also called an ambulette) is counted as an ambulance. These vehicles are not usually (although there are exceptions) equipped with life-support equipment, and are usually crewed by staff with fewer qualifications than the crew of emergency ambulances. Conversely, EMS agencies may also have emergency response vehicles that cannot transport patients. These are known by names such as nontransporting EMS vehicles, fly-cars or response vehicles.
The term ambulance comes from the Latin word "ambulare" as meaning "to walk or move about" which is a reference to early medical care where patients were moved by lifting or wheeling. The word originally meant a moving hospital, which follows an army in its movements. Ambulances (Ambulancias in Spanish) were first used for emergency transport in 1487 by the Spanish forces during the siege of Málaga by the Catholic Monarchs against the Emirate of Granada. During the American Civil War vehicles for conveying the wounded off the field of battle were called ambulance wagons.Field hospitals were still called ambulances during the Franco-Prussian War of 1870 and in the Serbo-Turkish war of 1876 even though the wagons were first referred to as ambulances about 1854 during the Crimean War.
Early car-based ambulances, like this 1948 Cadillac Meteor, were sometimes also used as hearses.
Fire Dept of New York ambulance, 1949
The history of the ambulance begins in ancient times, with the use of carts to transport incurable patients by force. Ambulances were first used for emergency transport in 1487 by the Spanish, and civilian variants were put into operation during the 1830s. Advances in technology throughout the 19th and 20th centuries led to the modern self-powered ambulances.
Ambulances can be grouped into types depending on whether or not they transport patients, and under what conditions. In some cases, ambulances may fulfil more than one function (such as combining emergency ambulance care with patient transport
Emergency ambulance - The most common type of ambulance, which provide care to patients with an acute illness or injury. These can be road-going vans, boats, helicopters, fixed-wing aircraft (known as air ambulances) or even converted vehicles such as golf carts.
Patient transport ambulance - A vehicle, which has the job of transporting patients to, from or between places of medical treatment, such as hospital or dialysis center, for non-urgent care. These can be vans, buses or other vehicles.
Response vehicle - Also known as a fly-car, nontransporting EMS vehicle and variations. A vehicle which is used to reach an acutely ill patient quickly, and provide on scene care. In some places, these vehicles can transport a patient, but only if they are able to sit in a regular car seat. Response units may be backed up by an emergency ambulance which can transport the patient, or may deal with the problem on scene, with no requirement for a transport ambulance. These can be a wide variety of vehicles, from standard cars, to modified vans, motorcycles, pedal cycles, quad bikes or horses. Fire engines are often used for this purpose in North America. These units can function as a vehicle for officers or supervisors (similar to a fire chief's vehicle, but for ambulance services).
Charity ambulance - A special type of patient transport ambulance is provided by a charity for the purpose of taking sick children or adults on trips or vacations away from hospitals, hospices or care homes where they are in long term care. Examples include the United Kingdom's 'Jumbulance' project. These are usually based on a bus.
Bariatric ambulance - A special type of patient transport ambulance designed for extremely obese patients equipped with the appropriate tools to move and manage these patients.
In the US, there are four types of ambulances. There are Type I, Type II, Type III and Type IV. Type I is based upon a heavy truck chassis with a custom rear compartment that is often referred to as a "box." Type I ambulances are primarily used for Advanced Life Support(ALS), also referred to as Mobile Intensive Care Unit(MICU) in some jurisdictions, and rescue work. A Type II ambulance is based on a commercial heavy-duty van with few modifications except for a raised roof and a secondary air conditioning unit for the rear of the vehicle. These types of ambulances are primarily used for Basic Life Support(BLS) and transfer of patients but it is not uncommon to find them used for advanced life support and rescue. Type III is a van chassis but with a custom-made rear compartment and has the same uses as Type I ambulances. Type IV is for smaller ad hoc patient transfer that use smaller utility vehicles in which passenger vehicles and trucks would have difficulty in traversing, such as large industrial complexes, commercial venues, and special events with large crowds; they generally do not fall under Federal Regulations.
Ambulances can be based on many types of vehicle although emergency and disaster conditions may lead to other vehicles serving as makeshift ambulances:
A modern American ambulance built on the chassis of a Ford F-450 truck, with extensive external storage
Van or pickup truck - A typical general-purpose ambulance is based on either the chassis of a van (vanbulance) or a light-duty truck. This chassis is then modified to the designs and specifications of the purchaser. Vans may either retain their original body and be upfitted inside, or may be based on a chassis without the original body with a modular box body fitted instead. Those based on pickup trucks almost always have modular bodies. Those vehicles intended for especially intensive care or require a large amount of equipment to be carried may be based on medium-duty trucks.
Car - Used either as a fly-car for rapid response or to transport patients who can sit, these are standard car models adapted to the requirements of the service using them. Some cars are capable of taking a stretcher with a recumbent patient, but this often requires the removal of the front passenger seat, or the use of a particularly long car. This was often the case with early ambulances, which were converted (or even serving) hearses, as these were some of the few vehicles able to accept a human body in a supine position. Some operators use modular-body transport ambulances based on the chassis of a minivan and station wagon.
Motorcycle and motor scooter - In developed areas, these are used for rapid response in an emergency as they can travel through heavy traffic much faster than a car or van. Trailers or sidecars can make these patient transporting units. See also motorcycle ambulance.
Patient being loaded into an medical helicopter
Bicycle - Used for response, but usually in pedestrian-only areas where large vehicles find access difficult. Like the motorcycle ambulance, a bicycle may be connected to a trailer for patient transport, most often in the developing world. See also cycle responder.
All-terrain vehicle (ATV) - for example quad bikes; these are used for response off-road, especially at events. ATVs can be modified to carry a stretcher, and are used for tasks such as mountain rescue in inaccessible areas.
Helicopter - Usually used for emergency care, either in places inaccessible by road, or in areas where speed is of the essence, as they are able to travel significantly faster than a road ambulance. Helicopter and fixed-wing ambulances are discussed in greater detail at air ambulance.
Fixed-wing aircraft - These can be used for either acute emergency care in remote areas (such as in Australia, with the 'Flying Doctors'), for patient transport over long distances (e.g. a re-patriation following an illness or injury in a foreign country), or transportation between distant hospitals. Helicopter and fixed-wing ambulances are discussed in greater detail at air ambulance.
Boat - Boats can be used to serve as ambulances, especially in island areas or in areas with a large number of canals, such as the Venetianwater ambulances. Some lifeboats or lifeguard vessels may fit the description of an ambulance as they are used to transport a casualty.
Ship - Ships can be used as hospital ships, mostly operated by national military services, although some ships are operated by charities. They can meet the definition of ambulances as they provide transport to the sick and wounded (along with treatment), though larger examples tend to be used more as primary care centres rather than as transport themselves. They are often sent to disaster or war zones to provide care for the casualties of these events.
Bus - In some cases, buses can be used for multiple casualty transport, either for the purposes of taking patients on journeys, in the context of major incidents, or to deal with specific problems such as drunken patients in town centres.Ambulance busses are discussed at greater length in their own article.
Trailer - In some instances a trailer, which can be towed behind a self-propelled vehicle can be used. This permits flexibility in areas with minimal access to vehicles, such as on small islands.
Horse and cart - Especially in developing world areas, more traditional methods of transport include transport such as horse and cart, used in much the same way as motorcycle or bicycle stretcher units to transport to a local clinic.
Hospital train - Early hospital trains functioned to carry large numbers of wounded soldiers. Similar to other ambulance types, as Western medicine developed, hospital trains gained the ability to provide treatment. In some rural locations, hospital trains now function as mobile hospitals, traveling by rail from one location to the next, then parking on a siding to provide hospital services to the local population. Hospital trains also find use in disaster response
Fire engine - Fire services (especially in North America) often train firefighters to respond to medical emergencies and most apparatuses carry at least basic medical supplies. By design, most apparatuses cannot transport patients unless they can sit in the cab.
Ambulance design must take into account local conditions and infrastructure. Maintained roads are necessary for road going ambulances to arrive on scene and then transport the patient to a hospital, though in rugged areas four-wheel drive or all-terrain vehicles can be used. Fuel must be available and service facilities are necessary to maintain the vehicle.
Truck-based ambulance in Columbus, Ohio using a pre-built box system
Truck-based ambulance in Antwerp, Belgium
Methods of summoning (e.g. telephone) and dispatching ambulances usually rely on electronic equipment, which itself often relies on an intact power grid. Similarly, modern ambulances are equipped with two-way radios or cellular telephones to enable them to contact hospitals, either to notify the appropriate hospital of the ambulance's pending arrival, or, in cases where physicians do not form part of the ambulance's crew, to confer with a physician for medical oversight.
Modern ambulances are typically powered by internal combustion engines, which can be powered by any conventional fuel, including diesel, gasoline or liquefied petroleum gas, depending on the preference of the operator and the availability of different options. Colder regions often use gasoline-powered engines, as diesels can be difficult to start when they are cold. Warmer regions may favor diesel engines, as they are thought to be more efficient and more durable. Diesel power is sometimes chosen due to safety concerns, after a series of fires involving gasoline-powered ambulances during the 1980s. These fires were ultimately attributed in part to gasoline's higher volatility in comparison to diesel fuel. The type of engine may be determined by the manufacturer: in the past two decades, Ford would only sell vehicles for ambulance conversion if they are diesel-powered. Beginning in 2010, Ford will sell its ambulance chassis with a gasoline engine in order to meet emissions requirements.
Many regions have prescribed standards which ambulances should, or must, meet in order to be used for their role. These standards may have different levels which reflect the type of patient which the ambulance is expected to transport (for instance specifying a different standard for routine patient transport than high dependency), or may base standards on the size of vehicle.
For instance, in Europe, the European Committee for Standardization publishes the standard CEN 1789, which specifies minimum compliance levels across the build of ambulance, including crash resistance, equipment levels, and exterior marking. In the United States, standards for ambulance design have existed since 1976, where the standard is published by the General Services Administration and known as KKK-1822-A. This standard has been revised several times, and is currently in version 'F' change #10, known as KKK-A-1822F, although not all states have adopted this version. The National Fire Protection Association has also published a design standard, NFPA 1917, which some administrations are considering switching to if KKK-A-1822F is withdrawn.. The Commission on Accreditation of Ambulance Services (CAAS) has published its Ground Vehicle Standard for Ambulances effective July 2016. This standard is similar to the KKK-A-1822F and NFPA 1917-2016 specifications.
The move towards standardisation is now reaching countries without a history of prescriptive codes, such as India, which approved its first national standard for ambulance construction in 2013.
Ambulances, like other emergency vehicles, are required to operate in most weather conditions, including those during which civilian drivers often elect to stay off the road. Also, the ambulance crew's responsibilities to their patient often preclude their use of safety devices such as seat belts. Research has shown that ambulances are more likely to be involved in motor vehicle collisions resulting in injury or death than either fire trucks or police cars. Unrestrained occupants, particularly those riding in the patient-care compartment, are particularly vulnerable. When compared to civilian vehicles of similar size, one study found that on a per-accident basis, ambulance collisions tend to involve more people, and result in more injuries. An 11-year retrospective study concluded in 2001 found that although most fatal ambulance crashes in the United States occurred during emergency runs, they typically occurred on improved, straight, dry roads, during clear weather. Furthermore, paramedics are also at risk in ambulances while helping patients, as 27 paramedics died during ambulance trips in the US between 1991 and 2006.
Interior of a mobile intensive care unit (MICU) ambulance from Graz, Austria
Four stages of deployment on an inboard ambulance tail lift
In addition to the equipment directly used for the treatment of patients, ambulances may be fitted with a range of additional equipment which is used in order to facilitate patient care. This could include:
Two-way radio - One of the most important pieces of equipment in modern emergency medical services as it allows for the issuing of jobs to the ambulance, and can allow the crew to pass information back to control or to the hospital (for example a priority ASHICE message to alert the hospital of the impending arrival of a critical patient.) More recently many services worldwide have moved from traditional analog UHF/VHF sets, which can be monitored externally, to more secure digital systems, such as those working on a GSM system, such as TETRA.
Mobile data terminal - Some ambulances are fitted with Mobile data terminals (or MDTs), which are connected wirelessly to a central computer, usually at the control center. These terminals can function instead of or alongside the two-way radio and can be used to pass details of jobs to the crew, and can log the time the crew was mobile to a patient, arrived, and left scene, or fulfill any other computer based function.
Evidence gathering CCTV - Some ambulances are now being fitted with video cameras used to record activity either inside or outside the vehicle. They may also be fitted with sound recording facilities. This can be used as a form of protection from violence against ambulance crews, or in some cases (dependent on local laws) to prove or disprove cases where a member of crew stands accused of malpractice.
Tail lift or ramp - Ambulances can be fitted with a tail lift or ramp in order to facilitate loading a patient without having to undertake any lifting. This is especially important where the patient is obese or specialty care transports that require large, bulky equipment such as a neonatal incubator or hospital beds. There may also be equipment linked to this such as winches which are designed to pull heavy patients into the vehicle.
Trauma lighting - In addition to normal working lighting, ambulances can be fitted with special lighting (often blue or red) which is used when the patient becomes photosensitive.
Air conditioning - Ambulances are often fitted with a separate air conditioning system to serve the working area from that which serves the cab. This helps to maintain an appropriate temperature for any patients being treated, but may also feature additional features such as filtering against airborne pathogens.
Data Recorders - These are often placed in ambulances to record such information as speed, braking power and time, activation of active emergency warnings such as lights and sirens, as well as seat belt usage. These are often used in coordination with GPS units.
In parts of the world which lack a high level of infrastructure, ambulances are designed to meet local conditions, being built using intermediate technology. Ambulances can also be trailers, which are pulled by bicycles, motorcycles, tractors, or animals. Animal-powered ambulances can be particularly useful in regions that are subject to flooding. Motorcycles fitted with sidecars (or motorcycle ambulances) are also used, though they are subject to some of the same limitations as more traditional over-the-road ambulances. The level of care provided by these ambulances varies between merely providing transport to a medical clinic to providing on-scene and continuing care during transport.
The design of intermediate technology ambulances must take into account not only the operation and maintenance of the ambulance, but its construction as well. The robustness of the design becomes more important, as does the nature of the skills required to properly operate the vehicle. Cost-effectiveness can be a high priority.
Emergency ambulances are highly likely to be involved in hazardous situations, including incidents such as a road traffic collision, as these emergencies create people who are likely to be in need of treatment. They are required to gain access to patients as quickly as possible, and in many countries, are given dispensation from obeying certain traffic laws. For instance, they may be able to treat a red traffic light or stop sign as a yield sign ('give way'), or be permitted to break the speed limit. Generally, the priority of the response to the call will be assigned by the dispatcher, but the priority of the return will be decided by the ambulance crew based on the severity of the patient's illness or injury. Patients in significant danger to life and limb (as determined by triage) require urgent treatment by advanced medical personnel, and because of this need, emergency ambulances are often fitted with passive and active visual and/or audible warnings to alert road users.
The passive visual warnings are usually part of the design of the vehicle, and involve the use of high contrast patterns. Older ambulances (and those in developing countries) are more likely to have their pattern painted on, whereas modern ambulances generally carry retro-reflective designs, which reflects light from car headlights or torches. Popular patterns include 'checker board' (alternate coloured squares, sometimes called 'Battenburg', named after a type of cake), chevrons (arrowheads - often pointed towards the front of the vehicle if on the side, or pointing vertically upwards on the rear) or stripes along the side (these were the first type of retro-reflective device introduced, as the original reflective material, invented by 3M, only came in tape form). In addition to retro-reflective markings, some services now have the vehicles painted in a bright (sometimes fluorescent) yellow or orange for maximum visual impact, though classic white or red are also common. Fire department-operated ambulances are often painted red to match the fire apparatuses.
Another passive marking form is the word ambulance (or local language variant) spelled out in reverse on the front of the vehicle. This enables drivers of other vehicles to more easily identify an approaching ambulance in their rear view mirrors. Ambulances may display the name of their owner or operator, and an emergency telephone number for the ambulance service.
Ambulances may also carry an emblem (either as part of the passive warning markings or not), such as a Red Cross, Red Crescent or Red Crystal (collective known as the Protective Symbols). These are symbols laid down by the Geneva Convention, and all countries signatory to it agree to restrict their use to either (1) Military Ambulances or (2) the national Red Cross or Red Crescent society. Use by any other person, organization or agency is in breach of international law. The protective symbols are designed to indicate to all people (especially combatants in the case of war) that the vehicle is neutral and is not to be fired upon, hence giving protection to the medics and their casualties, although this has not always been adhered to. In Israel, Magen David Adom, the Red Cross member organization use a red Star of David, but this does not have recognition beyond Israeli borders, where they must use the Red Crystal.
Fire service operated ambulances may display the Cross of St. Florian (often incorrectly called a Maltese cross) as this cross is frequently used as a fire department logo (St. Florian being the patron saint of firefighters).
Active visual warnings
An ambulance in Denmark with roof-integrated LED lights, plus side-view mirror, grill and front fend-off lights, and fog lamps wig-wags
The active visual warnings are usually in the form of flashing lights. These flash in order to attract the attention of other road users as the ambulance approaches, or to provide warning to motorists approaching a stopped ambulance in a dangerous position on the road. Common colours for ambulance warning beacons are blue, red, amber, and white (clear). However the colours may vary by country and sometimes by operator.
There are several technologies in use to achieve the flashing effect. These include flashing a light bulb or LED, flashing or rotating halogen, and strobe lights, which are usually brighter than incandescent lights. Each of these can be programmed to flash singly or in groups, and can be programmed to flash in patterns (such as a left -> right pattern for use when the ambulance is parked on the left hand side of the road, indicating to other road users that they should move to the right (away from the ambulance)). Incandescent and LED lights may also be programmed to burn steadily, without flashing, which is required in some provinces.
Emergency lights may simply be mounted directly on the body, or may be housed in special fittings, such as in a lightbar or in special flush-mount designs (as seen on the Danish ambulance to the right), or may be hidden in a host light (such as a headlamp) by drilling a hole in the host light's reflector and inserting the emergency light. These hidden lights may not be apparent until they are activated. Additionally, some of the standard lights fitted to an ambulance (e.g. headlamps, tail lamps) may be programmed to flash. Flashing headlights (typically the high beams, flashed alternately) are known as a wig-wag. Additional white lights may be placed strategically around the vehicle to illuminate the area around it when it is dark, almost always at the rear for loading and unloading stretchers and often at the sides as well. In areas very far North or South where there are times of year with long periods of darkness, additional driving lights at the front are often fitted as well to increase visibility for the driver.
In order to increase safety, it is best practice to have 360° coverage with the active warnings, improving the chance of the vehicle being seen from all sides. In some countries, such as the United States, this may be mandatory. The roof, front grille, sides and rear of the body, and front fenders are common places to mount emergency lights. A certain balance must be made when deciding on the number and location of lights: too few and the ambulance may not be noticed easily, too many and it becomes a massive distraction for other road users more than it is already, increasing the risk of local accidents.
A Whelen(R) siren with wail, yelp and phaser tones is a common sound in many cities
In addition to visual warnings, ambulances can be fitted with audible warnings, sometimes known as sirens, which can alert people and vehicles to the presence of an ambulance before they can be seen. The first audible warnings were mechanical bells, mounted to either the front or roof of the ambulance. Most modern ambulances are now fitted with electronic sirens, producing a range of different noises which ambulance operators can use to attract more attention to themselves, particularly when proceeding through an intersection or in heavy traffic.
The speakers for modern sirens can be integral to the lightbar, or they may be hidden in or flush to the grill to reduce noise inside the ambulance that may interfere with patient care and radio communications. Ambulances can additionally be fitted with airhorn audible warnings to augment the effectiveness of the siren system, or may be fitted with extremely loud two-tone airhorns as their primary siren.
A recent development is the use of the RDS system of car radios. The ambulance is fitted with a short range FM transmitter, set to RDS code 31, which interrupts the radio of all cars within range, in the manner of a traffic broadcast, but in such a way that the user of the receiving radio is unable to opt out of the message (as with traffic broadcasts). This feature is built into every RDS radio for use in national emergency broadcast systems, but short range units on emergency vehicles can prove an effective means of alerting traffic to their presence. It is, however, unlikely that this system could replace audible warnings, as it is unable to alert pedestrians, those not using a compatible radio or even have it turned off.
Non-acute patient transport ambulance from New Zealand.
The cost of an ambulance ride may be paid for from several sources, and this will depend on the local situation type of service being provided, by whom, and to whom.
Government-funded service - The full or the majority of the cost of transport by ambulance is borne by the local, regional, or national government (through their normal taxation).
Privately funded service - Transport by ambulance is paid for by the patient themselves, or through their insurance company. This may be at the point of care (i.e. payment or guarantee must be made before treatment or transport), although this may be an issue with critically injured patients, unable to provide such details, or via a system of billing later on.
Charity-funded service - Transport by ambulance may be provided free of charge to patients by a charity, although donations may be sought for services received.
Hospital-funded service - Hospitals may provide the ambulance transport free of charge, on the condition that patients use the hospital's services (which they may have to pay for).
There are differing levels of qualification that the ambulance crew may hold, from holding no formal qualification to having a fully qualified doctor on board. Most ambulance services require at least two crew members to be on every ambulance (one to drive, and one to attend the patient). It may be the case that only the attendant need be qualified, and the driver might have no medical training. In some locations, an advanced life support ambulance may be crewed by one paramedic and one EMT-Basic.
Common ambulance crew qualifications are:
First responder - A person who arrives first at the scene of an incident, and whose job is to provide early critical care such as cardiopulmonary resuscitation (CPR) or using an automated external defibrillator (AED). First responders may be dispatched by the ambulance service, may be passers-by, or may be dispatched to the scene from other agencies, such as the police or fire departments. They may be on duty for another agency, or volunteers who are on-call during their free time.
Ambulance driver - Some services employ staff with no medical qualification (or just basic first aid training) whose job is to simply drive the vehicle. In some emergency ambulance contexts this term is a pejorative towards personnel with higher medical training, as it implies they perform no function other than driving, although it may be acceptable for patient transport or community operations. Ambulance drivers may also have training in using the radio and knowing where medical supplies are stored in the ambulance.
Non-emergency driver/attendant - Have varying levels of training across the world, but these staff are usually only required to perform patient transport duties (which can include stretcher or wheelchair cases), rather than acute care. Dependent on provider, they may be trained in first aid or extended skills such as use of an AED, oxygen therapy and other lifesaving or palliative skills. They may provide emergency cover when other units are not available, or when accompanied by a fully qualified technician or paramedic.
Emergency care assistant/Emergency care support worker (ECA/ECSW) - Members of a frontline ambulance that drive the vehicles under both emergency and non-emergency conditions to incidents. Their role is to assist the clinician that they are working with, either a Technician or Paramedic, in their duties, whether that be drawing up drugs, setting up fluids (but not attaching), doing basic observations or performing 12 lead ECG assessments.
Emergency medical technician (EMT) - Also known as an Ambulance Technician. Technicians are usually able to perform a wide range of emergency care skills, such as defibrillation, spinal immobilization, bleeding control, splinting of suspected fractures, assisting the patient with certain medications, and oxygen therapy. Some countries split this term into levels (such as in the US, where there is EMT-Basic and EMT-Intermediate).
Paramedic - This is a high level of medical training and usually involves key skills not permissible for technicians, such as cannulation (and with it the ability to administer a range of drugs such as morphine), tracheal intubation and other skills such as performing a cricothyrotomy. Dependent on jurisdiction, the title "paramedic" can be a protected title, and use of it without the relevant qualification may result in criminal prosecution.
Emergency Care Practitioner - This position, sometimes called 'Super Paramedic' in the media, is designed to bridge the link between ambulance care and the care of a general practitioner. ECPs are already qualified paramedics who have undergone further training, and are trained to prescribe medicines for longer term care, such as antibiotics, as well as being trained in a range of additional diagnostic techniques. However, they do not have the full qualifications of a doctor.
Doctor - In some systems such as the SAMU in France, it is common for doctors to staff ambulances. On the other hand, this is rare in systems that rely heavily on paramedics or field nurses. In those cases, doctors may be present in specialist ambulance units - most notably the air ambulances.
Military ambulances have historically included vehicles based on civilian designs and at times also included armored, but unarmed, vehicles ambulances based upon armoured personnel carriers (APCs). In the Second World War vehicles such as the Hanomag Sd Kfz 251 halftrack were pressed into service as ad hoc ambulances, and in more recent times purpose built AFVs such as the U.S. M1133 Medical Evacuation Vehicle serve the exclusive purpose of armored medical vehicles. Civilian based designs may be painted in appropriate colours, depending on the operational requirements (i.e. camouflage for field use, white for United Nations peacekeeping, etc.). For example, the British Royal Army Medical Corps has a fleet of white ambulances, based on production trucks. Military helicopters have also served both as ad hoc and purpose-built air ambulances, since they are extremely useful for MEDEVAC. In terms of equipment, military ambulances are barebones, often being nothing more than a box on wheels with racks to place manual stretchers, though for the operational conditions and level of care involved this is usually sufficient.
Since laws of war demand ambulances be marked with one of the Emblems of the Red Cross not to mount offensive weapons, military ambulances are often unarmed. It is a generally accepted practice in most countries to classify the personnel attached to military vehicles marked as ambulances as non-combatants; however, this does not always exempt medical personnel from coming under fire--accidental or deliberate. As a result, medics and other medical personnel attached to military ambulances are usually put through basic military training, on the assumption that they may have to use a weapon. The laws of war do allow non-combatant military personnel to carry individual weapons for protecting themselves and casualties. However, not all militaries exercise this right to their personnel.
Recently, the Israeli Defense Forces has modified a number of its Merkava main battle tanks with ambulance features in order to allow rescue operations to take place under heavy fire in urban warfare. The modifications were made following a failed rescue attempt in which Palestinian gunmen killed two soldiers who were providing aid for a Palestinian woman in Rafah. Since M-113 armored personnel carriers and regular up-armored ambulances are not sufficiently protected against anti-tank weapons and improvised explosive devices, it was decided to use the heavily armoredMerkava tank. Its rear door enables the evacuation of critically wounded soldiers. Israel did not remove the Merkava's weaponry, claiming that weapons were more effective protection than emblems since Palestinian militants would disregard any symbols of protection and fire at ambulances anyway. For use as ground ambulances and treatment & evacuation vehicles, the United States military currently employs the M113, the M577, the M1133Stryker Medical Evacuation Vehicle (MEV), and the RG-33 Heavily Armored Ground Ambulance (HAGA) as treatment and evacuation vehicles, with contracts to incorporate the newly designed M2A0 Armored Medical Evacuation Vehicle (AMEV), a variant of the M2 Bradley Fighting Vehicle (formerly known as the ATTV).
Some navies operate ocean-going hospital ships to lend medical assistance in high casualty situations like wars or natural disasters. These hospital ships fulfill the criteria of an ambulance (transporting the sick or injured), although the capabilities of a hospital ship are more on par with a Mobile Army Surgical Hospital. In line with the laws of war, these ships can display a prominent Red Cross or Red Crescent to confer protection under the appropriate Geneva convention. However, this designation has not always protected hospital ships from enemy fire.
Reuse of retired ambulances
Retired ambulances may find reuse in less-demanding emergency services, such as this Ford E-Series former ambulance that has become a logistics unit.
When an ambulance is retired, it may be donated or sold to another EMS provider. Alternately, it may be adapted into a storage and transport vehicle for crime scene identification equipment, a command post at community events, or support vehicle, such as a logistics unit. Others are refurbished and resold, or may just have their emergency equipment removed to be sold to private businesses or individuals, who then can use them as small recreational vehicles. They may also have a perfectly serviceable body or vehicle (or both) separated from the other and reused.
Toronto City Council has begun a "Caravan of Hope" project to provide retired Toronto ambulances a second life by donating them to the people of El Salvador. Since laws in Ontario require ambulances to be retired after just four and a half years in service, the City of Toronto decommissions and auctions 28 ambulances each year.
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