Why do special forces soldiers have to be unidentifiable?

Anonymous
My fiance is from the military and is in special forces... just today he mention that if he dies in mission he have to be unidentifiable by the other party. Why so?
Updates
+1 y
He used to give his dog tags to his parents... now its me...
Those dog tags are used for identification purposes...
Why do special forces soldiers have to be unidentifiable?
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