Yup.  My dad was a RAD&#x2F;MAD operator on a P3 during the Vietnam War.  One of my indelible memories from childhood is him explaining how it worked and a story about seeing a Soviet sub on the surface.  Of course as a kid having watched Das Boot I&#x27;m expecting there to be guys scrambling to the conning tower, dive dive dive, depth charges, etc.  He&#x27;s like &quot;nah, the skipper just circled the thing and we waved at each other.&quot;  Seeing this story on HN makes me wish I could hear the story again but he passed of cancer a few years back.