You can go to the ACE website and check out all the credit recommendations for your MOS.
91B at the SSG (30) level gets about 29 for the MOS alone. http://militaryguides.acenet.e...sp?aceid=MOS-91B-007
Sometimes the college (possibly NCI) will give you credit at the next higher level. Excelsior gave me most of the credits for a 35L40, even though I'm still just a 30 level, with BNCOC. So, once you pin E5, try it and see if they'll award you the 29 credits. DEFINITELY worth it if you're working on a degree.