When I went through, SOPC 1 and SOPC 2 were before and after SFAS, respectively. It's been a while, and I haven't kept up with the changes.
Can you even fail OSUT and get a second chance in a different AIT?
But yeah, the reclass thing as JRB tells it only makes sense if whatever prevented him from going to SFAS also prevented him from being in the Infantry (even though he would already been an five-jump 11B), but didn't preclude him from being a refueler. I'm guessing being a "Petroleum Supply Specialist" isn't exactly high-speed, but I doubt they want pre-diabetics refueling helos any more than they want them in the infantry. So yeah.