missing person
person who has disappeared and whose status as alive or dead cannot be confirmed
missing in action
military casualty classification used for military persons missing during active service due to apparently involuntary reasons
Detainees-Disappeared
victim of kidnapings, usually in clandestine centers of detention and torture and following crime of forced disappearance in the dictatorships of Operation Condor
unreported missing
persons who cannot be found, yet have not been or cannot be reported as missing persons to law enforcement