Interesting help needed regarding Sub Vol

[Nicknyte]

So here is the scenario:

I went up to MEPS to sign a contract. They gave me (non-nuke) MM (Sub Volunteer). It was mainly a placeholder contract they gave me until I was possibly awarded a NUKE contract, where they would change my rate. I only signed it so I could get DEPped in and if things went south, I'd change my rate or just leave DEP.

I got word that my Nuke Waiver was approved, and I am stoked on going to school (as an old, soon to be, 26 yr. old grandpa), but I don't want to sub vol unless I am required to do so.

In short, when I am due to sign my contract once more, am I required to sign up for Sub Vol again, does the old Sub Vol contract take carry weight into this new contract, or can I just say No this time over? Thanks again.