"missing in action : (chiefly military) The designation for a member of an organization (usually..."

“missing in action : (chiefly military) The designation for a member of an organization (usually military) with whom contact is lost and whose whereabouts are not known, but whose death is not confirmed.
(by extension) Not present when one is expected to be.
Today, the third Friday of September in 2019, is National POW/MIA Recognition Day in the United States, which honors those who are prisoners of war or still missing in action.”

- https://en.wiktionary.org/wiki/missing_in_action#English

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