I am not a lawyer. This is not legal advice. If you want to look up the laew this is where to look. Ala.Code 1975 § 40-18-2 Levied; persons and subjects taxable generally.(6) Every nonresident individual receiving income from property owned or business transacted in Alabama;----------My non legal interpretation, "property owned or business transacted in Alabama", The federal government "owns" the propery within the bounderies of the state. Further, in my non-legal opinion, under the long arm provisions, you are subject to jurisdiction in the state because you avail yourself of the state on a regular systematic way by traveling by puposefully coming to the state on a regular basis by choice to work.You probably can file an Alabama tax return and get a refund. I don't know that for sure. It is worth looking into.