Every time a U.S. plane strafes a truck convoy or bombs out a bridge, the cost of Hanoi's involvement in South Viet Nam goes up another notch. Still, the U.S. has shown remarkable restraint by sparing a long list of choice and vital targets. The roster of restricted areas includes the docks of Haiphong harbor, the MIG jet fighter bases that ring Hanoi and the 25-mile zone bordering Red China, which is increasingly used as a sanctuary for truck convoys bringing supplies from China. Last week the U.S. decided to raise the North's costs considerably by striking hard at a...
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