You can find voter registration and absentee ballot request deadlines for your state by visiting our Election Dates and Deadlines directory. Be sure to click the box that says, "Overseas & Military Voters."
As an overseas voter, you should should send in a new Voter Registration/Ballot Request form to your local election official every calendar year during which you would like to vote, as well as whenever you change your address. You can submit your form as early as January 1 of that calendar year.