Prior enlisted, and a General? Color me skeptical.
Just read up on the Air Force Training ribbon and officers are also eligible for it upon completion of their OTS training. As for someone being prior enlisted and reaching Flag rank as an officer, it is rare but there are examples.
Cheers!
Here are some examples — https://militaryhistorynow.com/2016/04/01/mustangs-famous-generals-that-rose-from-the-ranks/