During the Vietnam War, the U.S. Army deployed electronic sensors along the Ho Chi Minh Trail in Laos, Cambodia, North Vietnam, and South Vietnam in order to detect and track troop and vehicle movements. At approximately 8,100 miles in length, monitoring this sophisticated logistics network--consisting of roads, trails, vehicle parks, petroleum pipelines, and storage areas--was no mean task. Since the work was classified as "Secret" until only recently,...
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