I'm only peripherally interested in military stuff, but here are some resources. In groups.io there is a group named Army-Radios If you google for GRC-106 radio you'll get a lot of info on that popular model. In particular www.rattrig.com TRC-75 is another one. www.militarytrader.com
There was a vehicular set using the Collins 618T airplane transceiver and I forget the nomenclature of it.
Jim W6JVE
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"Ya can argue all ya wanna, but it's dif'rent than it was." "No it ain't! No it ain't! But ya gotta know the territory." Meredith Willson, The Music Man