See my #47 below about my “California” USAF Texas brother & the Franchise Tax Board.
Your brother would have retired years before I ever enlisted, and decades before I was commissioned.
I still vote and am licensed in CA, but I do not pay taxes there or even file a return. I do not file a return in the state where I am stationed, either. This may be part of the "Soldiers and Sailors Relief Act", a federal law meant to protect service members from being unduly taxed.