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Designed by Draper Labs, manufactured by Northrup. My father-in-law worked on inertial guidance for Draper and retired in 1989, but I don't know if he ever worked on this project. Some things he wouldn't talk about because of security clearances. He did work on the Trident INS.

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My dad worked on the Trident guidance in the 1980s for Singer Kearfott. Very interesting career. Specifically, he improved the celestial navigation suite in the guidance system. The missile could determine it's location and plot it's course based on the location of the stars.

That sounds like an interesting challenge with today's technology. It's so impressive that this was accomplished at scale with Cold War era technology levels.

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