Maybe, after all wasn't the launch code for US nukes all zeros?

https://arstechnica.com/tech-policy/2013/12/launch-code-for-...

I'm sure there's a large group contractors who have fancy presentations and complex systems to protect nukes. They're very highly motivated, fiscally, to convince everyone they've done a good job. As for if that's actually the case, has there been any peer review?