The Maryland State Police has a dedicated team that tracks helicopter flights from takeoff to touchdown. But when Trooper 2 vanished during a Sept. 27 trip, no one immediately panicked. Follow the helicopter's final journey and listen to the voices of those who searched for two hours for the wreckage.

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SOURCE: Accident investigation file of the National Transportation Safety Board and audio tapes obtained by The Washington Post under public record act requests
GRAPHIC: Kat Downs, Mary Pat Flaherty, Jenna Johnson, Laris Karklis and Lauren Keane - The Washington Post

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