Central Intelligence Agency | The Debrief: Behind the Artifact - Seismic Detectors @CentralIntelligenceAgency | Uploaded December 2020 | Updated October 2024, 17 hours ago.
Some of the best collection devices are designed to be hidden in plain-sight. Our officers make devices which are disguised to blend naturally into surroundings, like these animal dung seismic detectors used on the Ho Chi Minh Trail during the Vietnam War. No one said these devices needed to be pretty to be effective.

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