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It would need entire new silos...  the largest solid ICBM ever officialy studied by the US was the 156" version of WS-120 concept. Preferred configuration was 120" diameter, though. During early MX development configurations studied was constrained by Minuteman silo size. The largest one was called "silo stuffer", that's self explaining. It had to use a cold launch technique because the silo would have to be stripped by all protection from exhaust gases to make room.

BTW, 92" is, as anyone knows, diameter of the Peacekeeper (which sitted in Minuteman silos).


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