Is there anyway I can reenlist before my 15 month window in January (with say a memo)?

Yes...if you're on assignment and/or incur an service remaining requirement which your current contract does not meet. See your servicing Career Counselor for individual qualifications.

Lookin' at that fat reenlistment bonus aren't ya?
;-)
Good luck.

See your retention NCO pronto. FYI Reenlistment NCOP dont always have the more current enlistment info. If you dont like what you hear ask around other retention NCOs.
Your incharge of your career no one else. I didnt get that until my final years.

Best resource to answer this would be your Retention NCO