Not to beat a dead horse, but residency doesn’t change wrt active duty military - domicile does. I had several domiciles across the country over the years and could legally purchase handguns, rifles or shotguns with a copy of my orders. My only residence remained the state I entered active duty from because I made no effort to change it. One of the benefits of the Soldiers and Sailors Civil Relief Act.
Regards,
GtG