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![449931.jpg](https://photos.usni.org/sites/default/files/imagecache/Photo_Full/usni_photo_gallery/tn_449931.jpg)
USS Agerholm (DD-826) (March 1961 photo) conducted the first so- called Desoto patrol surveillance of North Vietnamese coastal waters in December 1962. Authorized closest point of approach to North Vietnamese territory was 20 nautical miles.