If you have an arfcom account I’d post it over there, there a ton of .mil aviation folks on that site. I can fwd some of the pics to a friend of mine that was a combat controller if you want, he may know.
The 353d Combat Training Squadron has a long and distinguished history that encompasses several units. Originally organized on 12 Nov 1942 at Hamilton Field, CA and trained in aerial combat at Tonopah
www.eielson.af.mil
They were likely in the same fighter group, and that truck was part of group operations. I think it was used for forward-deployed/austere C3 operations. Given that the squadrons were activated/deactivated so many times from WW2 to the present, it's hard to date the vehicle, but based on some of the old tech, my SWAG puts it in the 60s or 70s?