B&Y - thanks. There is something called the 60 day rule which means you cannot apply for a licence renewal until 60 days prior to licence expiry (LASORS)
As for the 5 year period - the licence is only valid for 5 years and in addition to having a valid medical (appropriate to licence), LASORS talks about a valid Certificate of Test, Certificate of Experience or Certificate of Revalidation for any type/class rating that has not expired by more than 5 years.
I guess it boils down to whether the military IR counts as one of the Certificates above for a QSP - in which case you get 5 yrs from last Mil IRT. Not sure.
Of course if you are in current mil fg practice - you are squared either way for the renewal. My concern is not being in current fg practice at the time of the 60 day renewal window - in which case I may have to try and get an SEP rating and get back in a Cessna