A later extension of the scenario gives six-inch guns guided ammunition before smaller five-inch or 4.5-inch weapons receive it. That would provide a reason to retain six-inch guns. It could also influence the caliber chosen for destroyers. The proposal depends on successful guided-shell development and does not establish that such ammunition would be available during the early war.
Notable Point · 2:43:00-2:43:40
Guided shells could change destroyer gun calibres
Earlier guided ammunition for six-inch guns could influence later destroyer armament.