Here's the definition of "active duty":
(d) Duty Status.— The following definitions relating to duty status apply in this title:
(1) The term “active duty” means full-time duty in the active military service of the United States. Such term includes full-time training duty, annual training duty, and attendance, while in the active military service, at a school designated as a service school by law or by the Secretary of the military department concerned. Such term does not include full-time National Guard duty.
Based on this definition I would have to recant and say your borrower was not active duty military at the time of your loan.
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The opinions expressed are mine and they are not to be taken as legal advice.