Fla. Stat. § 97.0555

An individual or accompanying family member who has been discharged or separated from the uniformed services or the Merchant Marine, or from employment outside the territorial limits of the United States, after the book-closing date for an election pursuant to s. 97.055 and who is otherwise qualified may register to vote in such election until 5 p.m. on the Friday before that election in the office of the supervisor of elections. Such persons must produce sufficient documentation showing evidence of qualifying for late registration pursuant to this section.