Gutsy move indeed but it sounds like you've got the bases covered w/Guard duty. My 2 cents.... you've kept your powder dry since July so it sounds like the Guard is paying the bills -- that's good. And you've obviously considered the FDA's to be a non-player for you for whatever reason and that's good too IMHO -- you've done your homework. But to echo Popeye, I would be in MEM if they call. I wouldn't be taking a 30 day TDY ANYWHERE! If possible, I'd stay close to home unless FedEx will tell you of a class date otherwise.
Unfortunately (in this case - for you), I just met a new hire who got called on a Thurs for a following Monday class date. If you're on orders in BFE, you're going to be SOL.