Tax help for military filers

If I could piggyback on this comment, I have a similar situation just with one major difference. I am an American living in Germany with a military spouse. I am working on the Germany economy and am paid by my German employer. The last state I lived in prior to moving to Germany was Utah but I never registered to vote in Utah, do not have a Utah drivers license, and do not have any property or any family in Utah and therefore will not be returning to Utah. Prior to Utah, I lived in Illinois. I did not own property there and have no family there, but I was registered to vote there. My IL drivers license has expired and I only have my German license now. My husband’s state of residency is considered Pennsylvania by the military. It was suggested by someone that I could claim PA as my state of residence as well, but I’ve never even lived there before and certainly not earned income there. Because of all of this, why would I still need to have an affiliation with a state? Any help would be great!