For years the US military was criticized for using outdated floppy disks for the ICBM systems. Personally I always found that to be comforting, in that it seemed like a system that would be extraordinarily difficult or impossible to hack into online. But they finally made the update to more modern systems a few years ago, so we best beware of Cylons and Russian hackers now.
https://www.nytimes.com/2019/10/24/us/nuclear-weapons-floppy-disks.html
