Casualty evacuation, also known as CASEVAC or by the callsign Dustoff or colloquially Dust Off, is a military term for the emergency patient evacuation of casualties from a combat zone. Casevac can be done by both ground and air. "DUSTOFF" is the callsign specific to U.S. Army Air Ambulance units. DUSTOFF is an acronym meaning Dedicated Unhesitating Service To Our Fighting Forces. CASEVACs by air today are almost exclusively done by helicopter, a practice begun on a small scale toward the end of World War II; before that, STOL aircraft, such as the Fieseler Fi 156 or Piper J-3 were used. Casevac aircraft are a non standardized and non dedicated vehicle, that does not necessarily have en route care which is used to get a casualty back to another location where they can be treated by professional medical staff.
The primary difference between a CASEVAC and a medical evacuation (MEDEVAC) is that a MEDEVAC uses a standardized and dedicated vehicle providing en route care. On the other hand, CASEVAC uses non standardized and non dedicated vehicles that may (e.g., USAF "Pedros") or may not provide en route care. The service exists to transport casualties that are in dire need for evacuation from the battlefield and do not have time to wait on a MEDEVAC, or where a MEDEVAC is unable to get to the casualty. MEDEVAC aircraft and ground transport are mandated by the Geneva Convention to be unarmed and well marked. Firing on "clearly marked and identified" MEDEVAC vehicles would be considered a war crime under Article II of the Geneva Convention, in the same sense as firing on a Hospital Ship would be a war crime. CASEVAC transport are allowed to be armed since they are normally used for other purposes but carry no penalties for engagement by hostile forces. So in a sense, MEDEVAC transports are dedicated aircraft to transport casualties, CASEVAC is any transport used to move battlefield casualties.
"Dust Off" was the tactical call sign for medical evacuation missions first used in 1963 by Major Lloyd E. Spencer, Commander of the U.S. Army 57th Medical Detachment (Helicopter Ambulance). The name lasted the rest of the war. Typically Air ambulances would lift wounded soldiers to a hospital setting in less than an hour after being wounded. Flying into an active landing zone to pick up wounded was a dangerous job. Peter Dorland and James Nanney wrote in Dust Off: Army Aeromedical Evacuation in Vietnam, "... slightly more a third of the aviators became casualties in their work, and the crew chiefs and medical corpsmen who accompanied them suffered similarly. The danger of their work was further borne out by the high rate of air ambulance loss to hostile fire: 3.3 times that of all other forms of helicopter missions in the Vietnam War."
All members of the US Armed Forces today are trained in some form of basic first aid. While lacking advanced life saving equipment and medical personnel in regular vehicles, all personnel today enter the combat zone with an Improved First Aid Kit (IFAK)  on their equipment. The IFAK has basic medical supplies such as bandages, a tourniquet, and QuikClot gauze. Most units have stretchers and burn blankets in their vehicles.
In the U.S. Military, the terms CASEVAC and MEDEVAC are used interchangeably by most soldiers. An aerial CASEVAC (as defined by this article) is uncommon. This is due to exhaustive efforts by the U.S. Military to ensure that dedicated MEDEVAC platforms with trained medical personnel are available in the event of a casualty. This has, in part, led to a 90.6% casualty survival rate, compared to 80.9% in World War II.
In Australian military terminology, a CASEVAC refers to the evacuation of a small number of troops, usually just one.
- "Dust Off: Army Aeromedical Evacuation in Vietnam". Center of Military History, United States Army, Washington, D.C. 1982. Retrieved March 17, 2011.
- "Improved First Aid Kit Specification". US Army Medical Materiel Agency. Retrieved September 26, 2010.
- "Tactical Combat Casualty Care". Frank Butler, MD; Defense Health Board. Retrieved February 3, 2012.
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