Should have been a little clearer. I was refering to those who are residents of a state, but out of that state during the election. My better half is a travel nurse. We are usually in one place for 1-3 months. When we are out of Tennessee we vote absentee.
Travel nurses may or may not stay in one place long enough to register; I guess it depends. Where I live all you have to do is have someone vouch for you on election day. I say your better half should register where they work, fly back for election day, get a new job, or not vote. That is the price for having an election day. Early voting should be for need, not convenience.