* Killed in action (KIA): A casualty who dies as a result of combat or other hostile activity.
* Wounded in action (WIA): A casualty who is injured in combat or other hostile activity but does not die from the injuries.
* Missing in action (MIA): A casualty whose fate is unknown and who has not been found or declared dead.
Other categories of casualties include:
* Civilian casualties: Casualties that occur among non-combatants.
* Friendly fire casualties: Casualties that occur when one side of a conflict accidentally kills or injures its own personnel.
* Collateral damage casualties: Casualties that occur as a unintended result of military or other operations.
Casualties are often used as a measure of the severity of a conflict or disaster. The number of casualties can have a significant impact on the outcome of a war or the course of a natural disaster.