The basic premise that a submarine CO can just tell fire control to target the weapons to where he wants is laughable. Launch codes are provided and the sub has no way of knowing independently what the target is or of changing it.
Do they think the people that control nuclear launches are stupid or something? Do you think that they would allow it to be possible to hijack an SSBN and just have access to launching nucs on whoever you want?
Now I am not about to go into details about how such things are done but I will say the basic premise is crazy town lunacy.
