Yeah - if you go through one of the AF programs where you go full-time, you become a JAG. There's a program where the AF pays, you go full-time, and remain active-duty with pay/benefits. There's another one where you get released to go to school, pay for it yourself, don't get pay while you're there, but still get years towards retirement. I'm guessing the difference is the commitment you owe as a JAG. More info here: JAG programs
Really the only way to go to law school and not become a JAG is get stationed somewhere that has a night program for law school (not many out there, but I know there's one in Tampa, a few in DC, and some other places. Here's some more info: US News: Part-time law school
Rankings of part-time programs: Rankings
This is something I've looked into as well. I'd like to do law school, but don't want to be a JAG. Being a flyer, the only jobs I could get in DC or MacDill would be staff jobs, which would be a consistent schedule, but probably wouldn't be conducive to law school at night (most part-time programs take 4 years). But if you really want to do it you can make it work - good luck.
EDIT: to add rankings