Casualty is any person who is lost to his organization by reason of having been declared dead, wounded, injured, diseased, interned, captured, retained, missing, missing in action, beleaguered, besieged, or detained.

Mass casualty (MASCAL) is any number of casualties produced in a relatively short period of time, usually as the result of a single incident such as a military aircraft accident or armed attack that exceeds local medical support capabilities.

Triage is a process for sorting injured people into groups based on their need for or likely benefit from immediate medical treatment. Triage is used on the battlefield, at disaster sites, and in hospital emergency rooms when limited medical resources must be allocated.

Casualty evacuation (CASEVAC) is the movement of casualties aboard nonmedical vehicles or aircraft. En route medical care is not provided.

Medical evacuation (MEDVAC) is the timely, efficient movement of any person who is wounded, injured, or ill on medically equipped ground or air platforms to and/or between MTFs while providing en route medical care by medically trained personnel or crew members.

Casualty collection point (CCP), a specific location where casualties are assembled to be transported to an MTF, for example a company aid post.

Ambulance exchange point (AXP) is a location where a patient is transferred from one ambulance to another en route to an MTF.