One unit of women bird-dogged the American military units to make sure their radio traffic did not reveal too much about their whereabouts. The women intently studied the flow of U.S. military traffic to make sure that the Allies were not revealing the kinds of things that the enemy was revealing to them. They made charts and graphs to study American communications in specific regions, at specific times, during specific conflicts and events, to see what—if anything—might have been disclosed to the enemy. And they studied the characteristics of certain circuits. These same skills enabled the
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