Because, up until about a year ago, treasury.gov still had an old 1990s era point and click onscreen keyboard to enter your password into the system used to buy bonds. I believe they still do the "Is this your image?" bullshit - and the image never changes.
I work in electricity. All of our software, or rather the software running on any one of our several thousand Linux servers, is currently developed. They run grid monitoring, distribution, and optimization.
My point was more the government is so far behind the times, computer-knowhow-wise, that trying to make sense out of governmental IT requirements is a good way to drive you insane.
ICBM software, or whatever it is, is still on 8 inch floppies! Hell, I was cleaning an iT closet out and I found financial software that shipped with a 3-inch 3 ring binder that was the manual and it was an 8 inch floppy.
I took a picture and sent it to the office and asked if there was a museum market for the kit.
Gotcha. I used to work in DoD, so yeah definitely. That's an understatement.