That was a big deal back in the 70's I believe. The trainer planes from Vance AFB were using tractors and combines in the field for low level practice target runs. Probably for strafing.I remember as a kid while driving my red tractor being buzzed by two F-4 Phantoms. I swear they targeted me because it was red. Scared the peewaddlin out of me!
Scared the farmers/ranchers so much that they formed a committee and approached the leadership at Vance AFB to get it stopped, and it did. Don't remember a whole lot of details about it.
We have some long time past employees at Vance on here that may have more intel.
Back when working at the power plant east of Vance, I did a lot of environmental work on the 500' stacks. It wasn't uncommon to see one of the trainers headed directly toward the plant, then turn away close enough I got pics of the planes that could be blown up a bit to see the pilot. Posted a few of them on here in the past if anyone wants to do a search.