I had a long post, but deleted it.
This is going to read as harsh, but you need to read it.
TALK TO YOUR UNIT.
Step up and show to them you are in control of your own future. I get it, maybe you are afraid to rock the boat, or seem like a whiner. However, if you walk in and ask them directly if you will get back pay they will know. You are not the 1st cadet that had waiver issues, nor will be the last.
Now, if you have already done that, and they said "MAYBE", also understand any posters response in a positive is anecdotal at best. 2 yrs ago poster smith said yep, = 2 yrs ago.
I hope the best for you. I just want you to understand that this is your paycheck and you need to address the source of the pay directly, not an anonymous forum. Sorry if that sounds rude, unkind or harsh.