Absentee Voting for Uniformed Services and Overseas Citizens: Roles and Process, In Brief [September 4, 2020] [open pdf - 448KB]
From the Document: "Members of the military, their families, and overseas U.S. citizens face unique voting challenges. These can include delays in receiving or transmitting balloting materials; uncertainty about voter eligibility; and varying state, territorial, and local requirements. This CRS [Congressional Research Service] In Focus provides congressional readers with an overview of the federal statute designed to aid these voters, and their typical registration and voting process. It does not contain legal analysis and is not intended to provide guidance to individual voters."
CRS In Focus, IF11642
Congressional Research Service: https://crsreports.congress.gov/