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...of the modern "all-source" center, where tactical reports, cryptanalysis, direction finding, and other functions came together to locate German submarines threatening

...n-watt/watson-watt.htm] radar receives its first trial (then called "radio direction finding"}.

...t with ARVN infantry, but part of a [[signals intelligence]] team, doing [[direction finding]] on Viet Cong radio transmitters in the field, whose team was ambushed.