There are still daily changing codes.
But they are loaded a month at a time. OR they were when I was deep, deep into classified comms for the MEECN network.
The last time I saw any of it, it was a paper tape with a 30 day key.
And of course there was the hardware.
I well remember that, too. However, that was in the 1990’s.
As they say, you’ve come a long way Baby!
Some of that older gear isn’t being used. Of course, neither is the Internet per say, but their own global networks using TCP/IP technologies and encryption done by computers, not gear.