I know this is a two year old post, and someone touched on it with "basically a ham radio" but the TRC-179 Regency Net 'Force Terminal' setup was much more than that. They had these systems in duece-mounted shelters and the 'Team Terminal' component which would be dismountable, and typically housed in an M1009 CUCV Blazer, M151A2 1/4 ton or M998 HMMWV. Basically you had a completely EMP-hardened HF emergency communications system which had EMP-proof HF radios, data terminals, amps, UPSes, and so forth which was meant to be the communications system to fall back on for command and control in the event of nuclear Armageddon in Europe.
"Regency Net" replaced the older (poorly named for the purposes of morale) "Cemetery Net" (or 'Cemetery Talk') which, in time of War, became "Flaming Arrow Net" (a function mostly served by satellite now.) Because the system was set to be fielded just as the Cold War ended, all the Regency Net assets went more or less straight into storage after some wide area testing in CONUS, Europe and Korea/ Japan.
Two or three of the rack systems have shown up over the years (I think that's one of the racks less components lying down in one of the shelter pics), and FEMA wound up with an apparently large number of the backpack transceivers from the system (AN/GRC-215), but the bulk of it all seems to have been gutted from the shelters and shredded...despite the fact it was new/unissued. I know a few of our members have some Team Terminal components as well (I have the screen/ data entry component) but to my knowledge nobody has a complete Team Terminal with rack and components yet.
The Regency Net gear had a frequency hopping component meant to be used in nuclear-meltdown/ Flaming Arrow Net mode, and whatever gear was surplused had the hopping card removed. Fair Radio got some of the Force Terminal components years and years ago, and Mike Murphy had a bunch as well. Documentation is *very* spotty on the system, though there's a system overview manual out there from Magnavox, and radionerds.com has a couple of the Force Terminal manuals showing shelter setup/ parts details and the BII list courtesy of the HR pam.