Clearly you don’t understand US military doctrine in these sorts of situations. If someone sank a fleet carrier that would be seen as an act of war and would lead to a nuclear level escalation within minutes.
As for targeting civilians, no one targets civilians directly in nuclear exchanges. They perform strikes on military targets—the fact that civilians are in the way is purely collateral damage.
Fun fact though: a strike designed to destroy military targets (which are hardened and require large ground bursts) are often more deadly to the civilian population than just outright targeting cities (which are air bursts and don’t create nearly the amount of fallout).
I sure do, I just don't believe that any President who could be elected by this degenerated electorate would ever give the order to do what you suggest.
In late September and early October 2001, we took out a bunch of klystrons for testing to make sure they still worked. That was the best news I ever heard.
When we did not nuke Tora Bora, I knew it was a fantasy.
Our nukes will never be used.