Me. Stat. tit. 21-A § 780
A uniformed service voter or an overseas voter may request an absentee ballot as provided in section 753-A or by submitting a federal application or form requesting an absentee ballot as provided in section 783. With respect to any election for federal office, a clerk or the Secretary of State may not refuse to accept or process any otherwise valid voter registration application or absentee ballot application submitted by a uniformed service voter or an overseas voter on the grounds that the voter submitted the application more than 3 months before the election for which the application will be used. An application or request for an absentee ballot for a uniformed service voter or overseas voter that is accepted pursuant to section 753-A or section 783 remains valid for 18 months from the date of receipt of the application and entitles the voter to receive absentee ballots for all federal and state elections during that period. [2013, c. 131, §24(AMD).]
21-A M.R.S. § 780