Really? That is incredibly interesting, both because my contract sure as heck has no such clause, and since there are numerous AFIs, etc. that specifically state that your 8-year MSO starts on the day that you are commissioned. When you sign the HPSP, you are commissioned as a second lieutenant and placed into reserve (IRR) status during your med school education. Therefore, the clock starts on your 8 year MSO on your commissioning day.
Would you mind quoting the entire exact lines concerning IRR in your contract that you are referring to?
I believe this is it....but I'm a n-006, so maybe its not
Time spent in nonmilitary GPE or prior to completion of the professional degree requirements will not be creditable toward satisfying my AFHPSP
RSO. Additionally, time spent following completion of professional degree requirements or prior to completion of the AFHPSP ADO will not be credited
toward satisfying my AFHPSP RSO.