It dosen't matter if the MOS you extended for comes off any current BEAR MSG you will still get the Bonus in which you extended for at that time. Inclose is Para graph from the Bear MSG.
E. UPON SUCCESSFUL COMPLETION OF TRAINING, SOLDIERS PARTICIPATING IN THE BEAR PROGRAM AND
ENTITLED TO AN SRB WILL BE PAID EITHER THE BONUS AMOUNT IN EFFECT AT TIME OF EXTENSION IN THE BEAR PROGRAM OR THE BONUS AMOUNT LISTED IN THE SRB ENHANCED PROGRAM ON DATE OF
REENLISTMENT, WHICHEVER IS HIGHER.