I would wager that 90 percent of American combat troops killed in action during the Vietnam War never saw their killers. Whether it was a sniper at 200 yards, a rocket fired into a base camp or an attack from a well-concealed bunker complex, the element of surprise was usually on the side of our enemies. But our forces did have one elite weapon that sometimes took the advantage away. At times, these weapons even turned such situations upside down and enabled us to surprise and take them out....

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