Hmm. I wonder how well uhf digital modulation works in a nuclear fireball environment compared to uhf analog fm? The freq range (and power levels) used for mux is calculated to be resistant to nuclear fireball effects where it (the nuke) wipes out pretty much all radio waves for a short time and severely degrades others for a longer period within a few hundred miles of ground zero. In other words, apparently you can't send a signal thru a nuclear fireball from one side to the other, and some of the effects last due the volume of ionised air.
It wouldn't surprise me to see an upgraded mux, I mean they're trying to throw away one of the most effective warfighting platforms the US has ever developed (A10 Warthog), so why not ditch what works?
This site has a lot of info on the subject as far as hardware goes;
https://fas.org/nuke/guide/usa/c3i/index.htmlHowever, the section marked Combat Ciders is actually Combat Cinders.
Also 366.600 just lit up with modem traffic on orderwire.