A U.S. Navy task force of more than 20 vessels gathered in the Gulf of Tonkin last week for the start of one of the nation's first big postwar missions. Code-named "Endsweep," the operation will search out and destroy the thousands of mines that the U.S. laid down last May to cut off shipping to Haiphong and six other North Vietnamese ports.
Unlike the tethered globes that floated on or near the surface during World Wars I and II, most of these new weapons lie on the bottom, waiting to be exploded by ship noises, the magnetism of a ship's...
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