Found this re: dad's thrust termination design ....
Quote:
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The Hercules M57 third stage of Minuteman I & II had thrust termination ports on the sides. These ports, when opened by detonation of shaped charges, reduced the chamber pressure so abruptly that the interior flame was blown out. This allowed a precisely timed termination of thrust for targeting accuracy. The larger Minuteman III third stage motor also has thrust termination ports although the final velocity is determined by PSRE.
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LGM-30 Minuteman - Wikipedia, the free encyclopedia