In an alternate timeline, maximize the usage of trained dolphins for military purposes, as early as possible.
Could all of the world's largest navies have their own marine mammal program?
https://en.wikipedia.org/wiki/United_States_Navy_Marine_Mammal_Program
https://en.wikipedia.org/wiki/Military_dolphin#Soviet_Union_Navy_dolphins
Could all of the world's largest navies have their own marine mammal program?
https://en.wikipedia.org/wiki/United_States_Navy_Marine_Mammal_Program
https://en.wikipedia.org/wiki/Military_dolphin#Soviet_Union_Navy_dolphins