Measuring the flow of North Vietnamese men and materiel into South Viet Nam is no easy task. The most telling evidence arrives at the Pentagon and the White House in the form of sharp, 9-in.-square photographs ferried by Air Force courier planes from Asia each day. The pictures, showing Ho's men on the move, are the product of the most sustained, highly sophisticated aerial surveillance in military history.
Day in, day out, U.S. photo jets streak over North Viet Nam and Laos, filming huge patches— and tiny pockets— of jungled land, searching...
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