[userbinator]

I wonder if they're still using pure DOS for some things, or if they're running DOS applications on XP:

https://en.wikipedia.org/wiki/File:US_Navy_110129-N-7676W-15...

(Notice the floppy disks. They might actually be safer than USB drives, since the latter introduces considerably more attack area, whereas a floppy is an extremely dumb storage device.)

In any case, from a risk-management perspective, I believe that software tends to get more stable over time if the only things being done are bug fixes; it's the radical rewrites and adding features that comes with new versions that bring more bugs. If it works, why "rock the boat" with new unknowns - there is more to lose than gain in this situation. I wouldn't be surprised if almost all of the important bugs in XP have already been found and fixed, and the limitations identified. It's like an asymptotic curve.