State of Legal Residence Is a Choice, Not an Accident
Service members keep their state of legal residence when they move under orders. That means you can be stationed in one state and remain a taxpayer of another — and several states have no income tax or fully exempt military pay.
Your legal residence is established by intent and evidence: voter registration, driver's license, vehicle registration, and where you file. Mixing those signals across states is how families end up defending a residency claim to two revenue departments at once.