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All nuclear submarines carry all launch codes on board - as indicated in this article, 3 top officers can access them together.

Under US protocols, only the President can authorize the use of nuclear weapons, however the Secretary of Defense must also approve the use.

> Under US protocols.

I wasn't only talking about the US. There are many other countries in the world who own nukes and where their usage protocol is different.

Interesting factoid: The US made it's PAL (permissive access link) technology available to other nuclear powers, including enemies in order that they could secure their weapons against unauthorized use.

Which makes everyone better off.

How many are using their technology as well, then ?

And then there are stories that automated systems have this power too, like https://en.wikipedia.org/wiki/Dead_Hand_%28nuclear_war%29